Steel 20 (20A; 20B)

Designation

Name	The value
Designation GOST Cyrillic	20
Designation GOST Latin	20
Transliteration	20
By chemical elements	20

Name	The value
Designation GOST Cyrillic	20А
Designation GOST Latin	20A
Transliteration	20A
By chemical elements	20

Name	The value
Designation GOST Cyrillic	20В
Designation GOST Latin	20B
Transliteration	20V
By chemical elements	20W

Description

Steel 20 is used: for the manufacture of sheet metal, 1−2 mm 4−14 category, intended for cold forming; after normalization, or without heat treatment of the hooks of cranes, couplings, bearings and other components operating at temperatures from -40 °C to +450 °C under pressure; after HTO for the manufacture of gears, worms, worm pairs and other details, which are requirements of high surface hardness with a low strength of the core; cold-rolled fin tubes with outer diameter 32, 38 and 50 mm, designed for steam boilers with supercritical steam parameters; tubes of the superheaters, headers and piping of high-pressure boilers; carburized parts for a long, very long service at temperatures up to +350 °C; blanks parts of pipeline valves; parts such as bottoms, collar flanges, fittings, rings, tubes, tees and parts of rectangular shape for power equipment and pipelines with an absolute pressure of more than 3.9 MPa and thermal power plants; equipment and piping of nuclear power plants (NPP); parts and elements of pipelines of steam and hot water nuclear power plants (NPP), with a design ambient temperature no higher than 350 °C at an operating pressure of less than 2.2 MPa (22 kgf/cm²); tubes for plants of chemical and petrochemical plants with nominal pressure PN=19.6−98 MPa (200−1000 kgf/cm²); spirally pipes with two-sided joint for pipelines of nuclear power plants; pipes seamless high pressure (6−10 mm) for diesel fuel; hot-rolled steel profile for the manufacture of wheel rims for agricultural machines; electric-welded pipes for the manufacture of parts and structures in motovelotehnika; steel bent closed welded square and rectangular sections, intended for use in agricultural machinery, tractor and other sectors of the economy; cold-resistant seamless hot-deformed pipes for gas-lift systems and construction of gas fields; solid-rolled rings for different purposes; seamless, cold-drawn, warm, hot-wrought, including hot-pressed and hot-pressed reduced pipes for steam boilers and pipelines, installations with high and supercritical steam parameters; seamless cold-drawn, warm, hot-wrought, including hot-pressed and hot-pressed pipes is reduced, designed for steam boilers and pipelines, installations with high and supercritical steam parameters; bimetallic seamless tubes for shipbuilding with an outer layer of steel and an inner layer of copper, electric cold pipes for propeller shafts of automobiles, tractors and machines; hot-deformed seamless pipes used in shipbuilding for steam; seamless hot-deformed pipes with improved corrosion and cold-resistance (article 20A), with an outer diameter from 89 to 426 mm, strength class not less than K48, infield pipelines, transporting products of oil wells (low pressure water pipelines fresh and produced water at pressures up to 2 MPa in the system reservoir flooding); pipes seamless hot-deformed oil and gas increased corrosion resistance and cold-resistance designed for the construction and exploitation oil and gas in the Northern climatic zones of oil-producing enterprises of OAO «Nizhnevartovskneftegaz» with the ambient temperature from minus 50 °C to +40 °C temperature of the transported media from +5 °C to +40°C
; tubes with external transverse fins, made with welding currents of high frequency, steam boiler, designed for production of heating surfaces; the pipes used in aircraft; the bars used for the manufacture of car parts.

Note

The degree of deoxidation — SP.
Structural alloy steel of high corrosion resistance and cold-resistance.

Standards

Name	Code	Standards
Bars and shapes	В32	GOST 1050-88, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 10702-78, GOST 14955-77, GOST 1050-2013, OST 1 92049-76, TU 14-1-5414-2001, TU 14-1-1431-75, TU 14-1-2118-77, TU 14-1-3987-85, TU 14-1-4597-89, TU 14-1-5058-91, TU 14-1-5.14-73, TU 14-2-849-89, TU 14-11-245-88, TU 14-1-1529-2003, STP М323-80, TU 14-1-1271-75, TU 14-1-5228-93, TU 14-136-367-2008
Sheets and strips	В33	GOST 1577-93, GOST 4041-71, TU 14-1-522-93, TU 108.1273-84, TU 14-1-197-72, TU 14-1-2610-79, TU 14-1-3579-83, TU 14-1-4516-88, TU 14-1-4912-90, TU 14-1-5033-91, TU 14-1-5036-91, TU 14-1-522-73, TU 14-1-2471-78
Tape	В34	GOST 2284-79, GOST 10234-77, GOST 19851-74, TU 14-4-1010-79
Tape	В24	GOST 3560-73
Steel wire medium and high carbon	В72	GOST 3920-70, GOST 7372-79, GOST 9389-75, GOST 9850-72, GOST 17305-91, GOST 26366-84
Steel pipes and fittings to them	В62	GOST 550-75, GOST 3262-75, GOST 5005-82, GOST 5654-76, GOST 8639-82, GOST 8642-68, GOST 8644-68, GOST 8645-68, GOST 8646-68, GOST 8696-74, GOST 8732-78, GOST 8734-75, GOST 9567-75, GOST 10704-91, GOST 10705-80, GOST 10707-80, GOST 11017-80, GOST 12132-66, GOST 13663-86, GOST 19277-73, GOST 20295-85, GOST 21729-76, GOST 22786-77, GOST 23270-89, GOST 24950-81, GOST 30563-98, GOST 30564-98, GOST 8733-87, GOST 8731-87, GOST 13664-68, GOST Р 53383-2009, OST 24.125.30-89, HUNDRED 79814898 105-2008, TU 14-3Р-251-2007, TU 14-3-808-78, TU 14-3-1971-97, TU 108.790-87, TU 13-3-1486-87, TU 14-3-1128-2000, TU 14-3-1428-86, TU 14-3-1443-86, TU 14-3-1473-87, TU 14-3-1577-88, TU 14-3-251-74, TU 14-3-341-75, TU 14-3-377-87, TU 14-3-480-76, TU 14-3-523-76, TU 14-3-587-77, TU 14-3-675-78, TU 14-3-684-77, TU 1380-001-08620133-93, TU 14-157-54-97, TU 14-162-14-96, TU 14-162-20-97, TU 14-3-463-2005, TU 14-3-1303-84, TU 14-3-1083-81, TU 14-3-1486-87, TU 14-159-305-2005, TU 14-3-473-76, TU 14-159-263-96, TU 14-3P-63-2002, TU 14-161-171-97, TU 1380-001-08620133-05, TU 14-3Р-63-2002, TU 14-3-460-2009, TU 14-3Р-51-2001, TU 14-3Р-50-2001, TU 14-159-1128-2008, TU 14-3-1963-95, TU 14-161-148-94, TU 1317-006.1-593377520-2003, TU 1301-039-00212179-2010, TU 14-3-624-88, TU 14-3-377-99, TU 14-3-1128-2005, TU 1310-030-00212179-2007, TU 1373-022-05757850-08, TU 14-156-50-2003, TU 14-159-308-2006, TU 14-1-5598-2010, TU 14-3Р-55-2001, TU 24-18-233-93, TU 13.03-011-00212179-2003, TU 14-3Р-44-2001, TU 1303-002-08620133-01, TU 14-3-460-2003, TU 14-3Р-1128-2007, TU 14-3-190-2004, TU 14-3-1128-82, TU 14-3-1654-89, TU 1373-013-02949352-2003, TU 1303-007-12281990-2015, TU 14-158-113-99, TU 14-161-149-94
Low carbon steel wire	В71	GOST 5663-79
Sheets and strips	В23	GOST 82-70, GOST 14918-80, GOST 16523-97, GOST 16523-89, GOST 16523-70, GOST 103-2006, GOST 19903-90, TU 14-1-4220-87, TU 14-1-1934-76, TU 14-1-4632-93
Bars and shapes	В22	GOST 8239-89, GOST 8240-97, GOST 8278-83, GOST 8281-80, GOST 8282-83, GOST 8283-93, GOST 8319.0-75, GOST 8509-93, GOST 8510-86, GOST 9234-74, GOST 10551-75, GOST 11474-76, GOST 12492.5-90, GOST 25577-83, GOST 30245-2003, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006, OST 5.9087-84, TU 14-2-341-78, STP М326-80, TU 14-105-568-93
Processing of metals by pressure. Forgings	В03	GOST 8479-70, OST 5Р.9125-84, OST 108.030.113-87, OST 26-01-135-81, TU 108-11-908-87, ST ЦКБА 010-2004
Norms for calculation and design	В02	OST 1 00154-74
Blanks. Of the workpiece. Slabs	В21	OST 14-13-75
Welding and cutting metals. Soldering, riveting	В05	OST 26-260.453-92, OST 24.125.02-89
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, OST 1 90301-81, TU 26-07-1341-83, TU 108.11.902-87, TU 108.1398-86, TU 108.667-86, TU 108-938-80, TU 14-1-1672-76, TU 14-1-4221-87, TU 14-1-4944-90, TU 14-1-4992-91, TU 14-243-224-87, TU 08.002.05015348-92, TU 14-1-5185-93, TU 08.002.0501.5348-92, STP М322-90, TU 26-0251-16-78, TU 14-1-5.19-74, TU 1-92-156-90
Thermal and thermochemical treatment of metals	В04	ST ЦКБА 026-2005
Test methods. Packing. Marking	В29	TU 14-106-485-99

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	N	As	Al	V	Mo	Zn	Sn	Sb	Pb	Bi
GOST 21729-76	0.17-0.24	≤0.035	≤0.035	0.35-0.65	≤0.25	0.17-0.37	≤0.25	Rest	≤0.2	-	-	-	-	-	-	-	-	-	-
TU 14-1-3987-85	0.17-0.24	≤0.025	≤0.03	0.35-0.65	≤0.25	0.17-0.37	≤0.3	Rest	≤0.3	-	-	-	-	-	-	-	-	-	-
TU 14-1-5058-91	0.18-0.24	≤0.012	≤0.02	0.35-0.65	≤0.15	0.17-0.37	≤0.1	Rest	≤0.1	≤0.01	≤0.01	-	≤0.04	-	≤0.004	≤0.005	0.00015-0.00045	≤0.003	0.0002-0.00045
GOST 1050-88	0.17-0.24	≤0.04	≤0.035	0.35-0.65	≤0.25	0.17-0.37	≤0.3	Rest	≤0.3	≤0.006	≤0.08	-	-	-	-	-	-	-	-
GOST 11017-80	0.17-0.24	≤0.035	≤0.035	0.35-0.65	≤0.25	0.17-0.37	≤0.3	Rest	≤0.3	≤0.006	≤0.08	-	-	-	-	-	-	-	-
TU 14-3-460-2003	0.17-0.24	≤0.025	≤0.03	0.35-0.65	≤0.25	0.17-0.37	≤0.25	Rest	≤0.3	-	-	-	-	-	-	-	-	-	-
TU 14-3-808-78	0.17-0.24	≤0.04	≤0.035	0.35-0.65	≤0.25	0.17-0.37	≤0.25	Rest	≤0.25	≤0.006	≤0.08	0.02-0.08	-	-	-	-	-	-	-
TU 14-3-1971-97	0.17-0.21	≤0.008	≤0.012	0.35-0.65	≤0.25	0.17-0.37	≤0.3	Rest	≤0.3	-	-	0.02-0.05	≤0.06	-	-	-	-	-	-
TU 14-3-341-75	0.17-0.24	≤0.025	≤0.03	0.35-0.65	≤0.025	0.17-0.37	≤0.25	Rest	≤0.3	-	-	-	-	-	-	-	-	-	-
TU 14-162-14-96	0.17-0.22	≤0.015	≤0.015	0.5-0.65	≤0.25	0.17-0.37	≤0.25	Rest	≤0.25	-	-	0.03-0.05	-	-	-	-	-	-	-
TU 14-1-5185-93	0.18-0.24	0.002-0.015	0.005-0.015	0.35-0.65	≤0.15	0.17-0.37	≤0.15	Rest	≤0.15	0.002-0.012	≤0.01	0.002-0.009	0.002-0.1	-	0.0005-0.004	0.0005-0.004	0.0005-0.003	0.0003-0.004	0.0001-0.003
TU 08.002.0501.5348-92	0.17-0.24	≤0.02	≤0.035	0.35-0.65	≤0.25	0.17-0.37	≤0.3	Rest	≤0.3	-	-	-	-	-	-	-	-	-	-
TU 14-159-1128-2008	0.17-0.24	≤0.025	≤0.03	0.35-0.65	≤0.25	0.17-0.37	≤0.3	Rest	≤0.3	≤0.006	≤0.08	-	-	-	-	-	-	-	-
TU 14-161-149-94	0.17-0.24	≤0.013	≤0.018	0.35-0.65	-	0.17-0.37	≤0.25	Rest	≤0.25	-	-	-	-	-	-	-	-	-	-
TU 1317-006.1-593377520-2003	0.17-0.24	≤0.015	≤0.017	0.35-0.65	≤0.4	0.17-0.37	≤0.25	Rest	≤0.25	≤0.008	-	0.02-0.05	≤0.05	-	-	-	-	-	-
TU 1301-039-00212179-2010	0.17-0.24	≤0.025	≤0.03	0.35-0.65	≤0.25	0.17-0.37	≤0.25	Rest	≤0.3	-	-	-	-	≤0.15	-	-	-	-	-
TU 14-3Р-1128-2007	0.17-0.24	≤0.025	≤0.03	0.35-0.65	≤0.25	0.17-0.37	≤0.3	Rest	≤0.3	≤0.008	-	-	-	-	-	-	-	-	-
TU 14-158-113-99	0.17-0.24	≤0.013	≤0.018	0.35-0.65	-	0.17-0.37	-	Rest	≤0.25	≤0.008	-	0.02-0.05	-	-	-	-	-	-	-

Fe is the basis.
According to TU 14-1-1672-76, the chemical composition is given for steel grade 20A. The residual copper content is allowed no more than 0.25% when the steel is scrap-process. Deviations from the norms of chemical composition in accordance with GOST 1050 are allowed. At the request of the order, steel can be supplied with narrowed limits of carbon content - "select": 0.19-0.25%; 0.19-0.23%; 0.22-0.25%; 0.21-0.24%.
According to GOST 1050-88, the nitrogen content is specified for the steel of the oxygen-converter method of smelting. For all other types of smelting, the nitrogen content was N≤0.008%.
According to TU 14-1-5185-93, TU 14-1-5058-91 the chemical composition is given for steel grade 20bv.
According to TU 08.002.0501.5348-92 the chemical composition is given for steel grade 20-Ш.
According to TU 14-1-3987-85 the chemical composition is given for steel grade 20.
According to TU 14-1-1529-2003, TU 14-3-460-2003 and TU 14-3-341-75 for steel produced by scrap process or from cuprous ores, the mass fraction of residual copper and nickel is allowed up to 0.30 % of each. A technological addition of rare earth elements is allowed to improve the quality of the metal.
According to TU 14-3P-55-2001 the chemical composition is given for steel 20; for steel 20-PV, the carbon mass fraction is 0.18-0.24%, chromium, nickel, copper, sulfur, and phosphorus ≤ 0.15% each, the mass fraction of the remaining elements is identical to grade 20. In steel 20, the content of nickel and chromium not more than 0.40% each. The presence of rare-earth elements introduced as technological additives is allowed.
According to GOST 19277-73, GOST 21729-76 chemical composition is given for steel 20A. When smelting steel skapprotsessom the mass fraction of copper should be ≤ 0,25%. Limit deviations in chemical composition - in accordance with GOST 1050.
According to TU 1317-006.1-593377520-2003 the chemical composition is given for steel grade 20A. The mass fraction of hydrogen in the steel in the metal of the pipe should not exceed 1.0 ppm (2.0 ppm in the ladle sample, niobium and titanium can be added from the calculation of the mass fraction to 0.030% and 0.010%, respectively.) In the deoxidized steel for the globularization of sulfide inclusions enter calcium (silicocalcium) or cerium from the calculation of the mass fraction of 0.050%.
According to TU 14-162-14-96 the chemical composition is given for steel grade 20A. Variations in the carbon content (-0,020%), aluminum (± 0,010%), manganese (+0,15%), sulfur (+0,005%), phosphorus (+0,005%) are allowed in the steel. In order to increase the strength properties, it is allowed to introduce into the steel vanadium in an amount up to 0.050%.
According to TU 14-3-1971-97, the chemical composition is given for steel grade 20B with enhanced corrosion resistance and operational reliability. To ensure the fine structure of the structure, vanadium is introduced to 0.06%. The carbon equivalent of Seques should not exceed 0.40%.
According to TU 1301-039-00212179-2010 the chemical composition is given for steel grade 20-III. The content of each impurity element, not regulated by the table, is allowed up to 0.050%.
According to TU 108.1273-84, deviations in nickel + 0.20%, copper + 0.20% are allowed.
According to TU 14-158-113-99, the chemical composition is given for steel grade 20 with increased corrosion resistance and cold resistance. In the finished metal, deviations in chemical composition are allowed in accordance with GOST 1050, in addition - for aluminum +0.0050%. With a mass fraction of nitrogen of more than 0.0080%, vanadium microalloying is not less than 0.030%.
According to TU 14-161-149-94, the chemical composition is given for steel grade 20 for casing pipes and couplings for them with hydrogen sulfide-resistant and cold-resistant ones.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	d₄	d	y, %	KCU, kJ/m²	HB, MPa	HRB
Tape flatted average strength of 0.1-4.0 mm according to GOST 10234-77 in the state of delivery (indicated delivery)
-	-	540-690	-	-	-	-	-	-	-
-	-	690-830	-	-	-	-	-	-	-
-	-	≤540	-	-	≥15	-	-	-	-
-	-	≤410	-	-	-	-	-	-	-
Wire for cold heading as supplied by GOST 5663-79
-	470-620	-	-	-	-	≥55	-	-	-
-	≤640	-	-	-	-	≥50	-	-	-
Longitudinal electric-welded pipes (Dy=10-530 mm) in the delivery condition. Listed marsvolta base metal
	≥245	≥412	≥21	-	-	-	-	-	-
Hot-rolled steel and hot rolled with special surface finish
-	-	-	-	-	-	-	-	≤132	-
Steel calibrated and calibrated with special surface finish
-	-	≥490	≥7	-	-	≥40	-	≤207	-
-	-	390-490	-	-	-	≥50	-	≤163	-
Forgings. Normalization at 880-900 °C
-	≥245	≥410	≥25	-	-	≥55	-	≥163	-
Tubes seamless cold - and hot-deformed in the delivery condition heat-treated (NV - wall > 10 mm)
	≥255	≥431	≥22	-	-	≥50	≥780	≤156	-
	≥245	≥412	≥23	-	-	-	-	≤156	-
Bimetalic seamless tubes for shipbuilding with an inner layer of copper, heat-treated in the delivery condition according to GOST 22786-77
	-	≥304	≥26	-	-	-	-	-	-
Of pipes supplied according to GOST 13663-86
-	≥245	≥412	≥20	-	-	-	-	-	-
-	-	≥372	≥10	-	-	-	-	-	-
Cold-rolled steel strip of 0.1-4.0 mm in the delivery state according to GOST 2284-79
-	-	310-540	-	≥18	-	-	-	-	-
Ring forged in OST 1 92049-76. Normalization
25	≥235	≥390	≥19	-	-	≥44	-	-	-
Sheet heat-treated 1 and 2 category
-	-	340-490	≥28	-	-	-	-	-	-
The sheets in the delivery condition on the other 108.1273-84
-	≥176.4	≥352.8	≥22	-	-	≥40	≥490	-	-
The strip in the delivery condition (without heat treatment in the etched condition) on the other 14-1-522-93
-	≥255	≥350	≥25	-	-	-	-	-	-
The normalized or hot rolled strip
80	≥250	≥410	≥25	-	-	≥55	-	-	-
Long products (wire). Annealing at 880-900 °C
25	≥270	≥480	≥30	-	-	≥62	≥1422	-	-
Graduate steel of hot rolled, forged and silverfish 2nd category after normalization
	-	≥410	≥25	-	-	≥55	-	-	-
Tubular billet + hot deformed Tubes (DH=57-465 mm) TU 14-3-460-2003. Normalization at 920-950 °C, air cooling
25	≥245	410-550	≥24	-	-	≥45	≥490	-	-
Pipe the seamless hot-deformed oil and gas, high cold resistance and corrosion resistance in delivery condition on the other 14-158-113-99. In the graph KCU values KCV+20°C/KCV-40°C/KCV-50°C
	338-470	502-627	≥25	-	-	-	≥1471/981/392	-	≤92
Seamless hot deformed tubes enhanced corrosion resistance and cold-resistance in delivery condition and after heat-if the thermo-mechanical processing on the other 14-161-148-94 (samples, in cross-section is specified outside diameter)
57-168	338-470	502-598	≥25	-	-	-	-	-	≤92
Pipe the seamless hot-deformed heat-treated in the delivery condition on the other 14-162-14-96
	338-470	502-627	≥25	-	-	-	-	-	≤92
Seamless pipes for oil and fuel lines, heat-treated in the delivery condition according to GOST 19277-73
	-	≥392	≥22	-	-	-	-	-	-
Seamless pipes for steam boilers and pipelines of steel grades 20, 20-PV according to TU 14-3P-55-2001. Normalization at 920-950 °C, air cooling
-	≥216	412-549	≥24	-	-	≥45	≥490	-	-
Seamless tubes of steel 20-ø in delivery condition on the other 1301-039-00212179-2010. Normalization at 920-950 °C, air cooling (accelerated cooling is allowed; allowed after normalization the holidays at 600-650 °C)
-	≥215	410-550	≥22	-	-	≥40	≥590	-	-
Seamless tubes gas & oil heat-treated in the delivery condition on the other 1317-006.1-593377520-2003, TU 14-3-1971-97 (samples in the delivery condition specified strength class, in the column the value is KCU KCV-50 °C)
89-426	338-451	≥470	≥25	-	-	-	≥980	-	≤92
Pipe seamless cold drawn, cold rolled and toplocatie, heat-treated in the delivery condition according to GOST 21729-76
	-	≥392	≥22	-	-	-	-	-	-
Of casing pipe and coupling them serovodoroda and cold-resistant from steel grade 20, thermally and thermo-mechanical processed in the state of delivery on the other 14-161-149-94. In the delivery condition specified product and band strength DS. In the graph given the values of KCU KCV at different temperatures test KCV+20°C/KCV-40°C<</th>
-	402-490	≥510	≥20	-	-	-	≥1373/589	-	≤90
Pipe cold-rolled fin on the other 14-3-341-75. Normalization at 920-950 °C, air cooling
32, 38, 50	≥216	412-550	≥24	-	-	-	-	-	-
Pipe spirally with double sided welding for pipelines AC. In the delivery condition
	≥245	410-550	≥23	-	-	≥45	≥294	-	-
Electric-welded cold-deformed pipes for cardan shafts according to GOST 5005-82 (samples, in cross-section shows the thickness of the wall)
≤3	≥450	≥550	≥8	-	-	-	-	-	-
3	≥390	≥510	≥8	-	-	-	-	-	-
Seamless pipes for chemical and petrochemical industries in the state of delivery (indicate the cutting direction of the sample and tadisina wall section)
≤20	≥235	≥412	≥21	-	-	-	≥392	111-156	-
20	≥235	≥392	≥21	-	-	-	≥392	111-156	-
20	≥235	≥392	≥23	-	-	-	≥490	111-156	-
Blank pieces of pipe fittings. Extract at 900-920 °C (2.5-4.0 hours depending on the thickness and weight of the workpiece) annealing in air
800	175	355	≥20	-	-	≥40	≥481	143-179	-
Steel grooved 5-th category
-	-	≥490	≥7	-	-	≥40	-	-	-
-	-	≥390	≥21	-	-	≥50	-	-	-
Forgings. Hardening + Vacation
100-300	≥245	≥470	≥19	-	-	≥42	≥383	143-179	-
Forgings. Normalization
100-300	≥175	≥350	≥24	-	-	≥50	≥579	101-143	-
300-500	≥175	≥350	≥22	-	-	≥45	≥530	101-143	-
500-800	≥175	≥350	≥20	-	-	≥40	≥481	101-143	-
100	≥175	≥350	≥28	-	-	≥55	≥628	101-143	-
100-300	≥195	≥390	≥23	-	-	≥50	≥530	111-156	-
100	≥195	≥390	≥26	-	-	≥55	≥579	111-156	-
100-300	≥215	≥430	≥20	-	-	≥48	≥481	123-167	-
100	≥215	≥430	≥24	-	-	≥53	≥530	123-167	-
Hot-rolled sheet in the delivery condition. Group strength К350В
≤2	-	350-500	-	≥22	-	-	-	-	≤77
2-3.9	-	350-500	-	≥23	-	-	-	-	≤77
Cold-rolled sheet in the delivery condition. Group strength К350В
≤2	-	350-500	-	≥23	-	-	-	-	≤77
2-3.9	-	350-500	-	≥24	-	-	-	-	≤77
Rolled steel. Annealing at 880-900 °C
-	-	≥30	≥59	-	-	≥100	-	-	-
-	-	≥130	≥39	-	-	≥94	-	-	-
-	≥140	≥245	≥40	-	-	≥86	-	-	-
-	≥150	≥340	≥39	-	-	≥81	-	-	-
-	≥170	≥415	≥29	-	-	≥64	-	-	-
-	≥230	≥405	≥28	-	-	≥67	-	-	-
-	-	≥20	≥64	-	-	≥100	-	-	-

Description mechanical marks

Name	Description
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_U	Limit short-term strength
d₅	Elongation after rupture
d₄	Elongation after rupture
d	Elongation after rupture
y	The relative narrowing
KCU	Toughness
HB	Brinell hardness number
HRB	Rockwell hardness (indenter steel, spherical)

Physical characteristics

Temperature	Е, HPa	G, HPa	r, kg/m³	l, W/(m · °C)	R, Mr. · m	a, 10^-6 1/°C	С, J/(kg · °C)
0	212	78	7859	-	-	-	-
100	208	77	7834	51	219	123	486
200	203	76	7803	49	292	131	498
300	197	73	7770	44	381	138	514
400	189	69	7736	43	487	143	533
500	177	66	7699	39	601	148	555
600	163	59	7659	36	758	-	584
700	140	-	7917	32	925	151	636
800	-	-	7624	26	1094	-	703
900	-	-	7600	26	1135	152	-
1000	-	-	-	-	-	-	703
1200	-	-	-	-	-	-	695

A description of the physical symbols

Name	Description
Е	The normal elasticity modulus
r	Density
l	Coefficient of thermal conductivity
R	UD. the resistivity
a	The coefficient of linear expansion
С	Specific heat

Technological properties

Name	The value
Weldability	Welded without restriction, except for the parts after chemical and heat treatment. The welding methods of SMAW, ADS submerged arc and gas protection, the CCC. For manual arc welding using electrodes MP-3 or УОНИ13/45A; for automatic submerged arc - welding wire SV-08A, SV-08ГА or SV-10G2 with flux an-348A; for welding in protective gases Ar and CO2 welding wire SV-08G2S.
Склонность к отпускной хрупкости	Tend not.
The temperature of forging	Start - 1280 °C, the end - 750 °C. air Cooling.
Flock-sensitive sensitivity	not sensitive.
Machinability	In hot rolled state at NV 126-131 and blower SB=450-490 MPa Kn TV.SPL.=1,7 Kn b.St.=1,6.
Macrostructure and pollution	Contamination of the steel pipe casing and couplings thereto serovodoroda and cold-resistant on the other 14-161-149-94 non-metallic inclusions (OS, OT, SP, CX) must not exceed the average score of 2.5.
Microstructure	The size of austenite grains in the steel should be not larger than 5 numbers according to GOST 5639.
Corrosion resistance	In the medium H2S: speed General corrosion ≤ 0.5 mm/year; resistance to hydrogen cracking in the CLR ≤ 3 % CTR ≤ 6 %; resistance to sulfide corrosion cracking with voltage ≥ 75 % of σ0,2. TU 14-3-1971-97 metal pipe shall withstand the tests for hydrogen cracking in the NACE standard TM 02 84 (test environment NACE TM 01 77). Limiting values of coefficients of length (CLR) and crack thickness (CTR) should not exceed, respectively, 3 and 6%. Metal pipe shall pass the test for resistance to sulfide stress cracking. The threshold voltage of SSC must be at least 75% (254 MPa) of the minimum guaranteed yield stress of the material. The rate of General corrosion of metal pipes should not exceed 0.5 mm/year.
Surfacing	Surfacing of sealing surfaces of valves in accordance with OST 26-07-2028-81 is made by manual arc welding electrodes type e-20X13 with plaster SSSI-13НЖ, NII-48, NII-48Ж-1 or SV wire-12H13 or SV-20X13. Surface preparation for overlay welding is performed by machining. Surfacing is performed with preliminary and accompanying heating to 400-450 °C is not less than 3 layers with thickness not less than 4 mm, excluding allowance for machining. Heat treatment after welding is produced by tempering at 550-600 °C (delay of 2-5 h) hardness HB=301-350, at 600-650 °C (delay of 2-5 h) hardness HB=240 to 300, at 400-450 °C (delay of 2-5 h) hardness HB=351-400. The temperature of the furnace when loading the details for the home should be no more than 300 °C.