Steel 15H5M (H5M)

Designation

Name	The value
Designation GOST Cyrillic	15Х5М
Designation GOST Latin	15X5M
Transliteration	15H5M
By chemical elements	15Cr5Mo

Name	The value
Designation GOST Cyrillic	Х5М
Designation GOST Latin	X5M
Transliteration	H5M
By chemical elements	Cr5Mo

Description

15X5M steel is used: for the manufacture of housings and internal components of the apparatus refineries and cracking of pipes, pumps, valves, spetskrepezh, pipes and other parts which require resistance to oxidation at temperatures up to +600 °C; details of pipes and valves (tempering air + vacation at 400 °C, air cooling); furnace and a communication pipe used in power and heat networks; of billets intended for production of tubes of the cracking units of oil refining.

Note

Steel martensitic class.
Temperature intense scaling +650 °C.

Standards

Name	Code	Standards
Sheets and strips	В23	GOST 103-2006
Bars and shapes	В22	GOST 1133-71, GOST 2590-2006, GOST 2591-2006
Sheets and strips	В33	GOST 4405-75, GOST 7350-77, TU 14-1-2657-79
Steel pipes and fittings to them	В62	GOST 550-75, TU 14-3-442-76, TU 14-3-457-76, TU 14-3-463-2005, TU 14-3-1080-81, TU 14-3Р-62-2002, TU 14-3Р-115-2010
Bars and shapes	В32	GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST 20072-74, TU 14-11-245-88
Processing of metals by pressure. Forgings	В03	OST 26-01-135-81, TU 0306.018-80
Thermal and thermochemical treatment of metals	В04	ST ЦКБА 026-2005
Blanks. Of the workpiece. Slabs	В31	TU 14-1-1834-76, TU 14-1-583-73, TU НЗЛ 341-93

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo	W
TU 14-1-583-73	≤0.15	≤0.025	≤0.03	≤0.5	4.5-6	≤0.5	≤0.6	Rest	≤0.2	≤0.05	≤0.03	0.45-0.6	≤0.3
GOST 20072-74	≤0.15	≤0.025	≤0.03	≤0.5	4.5-6	≤0.5	≤0.6	Rest	≤0.2	≤0.05	≤0.03	0.45-0.6	≤0.3

Fe is the basis.
According to GOST 20072-74, when steel is scrap-process, the content of Cu ≤ 0.30%. When smelting steel by the method of electroslag remelting, the mass fraction of sulfur should not be more than 0.015%. Tungsten is allowed up to 0.30%, vanadium to 0.050% and titanium to 0.030%.
According to TU 14-1-583-73, the chemical composition is given for steel grade 15X5M. In the finished rolled products, deviations in chemical composition are allowed in accordance with GOST 20072. Modification of the steel with cerium is possible at the rate of 0.050%. The mass fraction of cerium is not determined by chemical analysis.

Mechanical properties

Section, mm	t отпуска, °C	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa	HRC
Blank pieces of pipe fittings. Annealing in air from 950-970 °C (exposure for 2.5-4.5 hours depending on the thickness and weight of the workpiece) + Vacation at 750-770 °C, cooling in furnace up to 400 °C and then air
≤200	-	≥294	≥490	≥18	≥40	≥588	149-197	-
Long products (sample). Annealing in air from 900 °C + Vacation, air cooling
-	200	≥990	≥1260	≥16	≥63	-	-	≥35
Samples from pipes with a wall thickness of 10-12 mm. Normalization + Vacation
-	-	≥485	≥640	≥18	≥78	-	-	-
Long products (sample). Annealing in air from 900 °C + Vacation, air cooling
-	400	≥1010	≥1220	≥18	≥64	-	-	≥35
Hot rolled sheet (4,0-50,0 mm) and cold rolled (4,0-5,0 mm) steel according to GOST 7350-77. Annealing at 840 - 870 °C, air cooling
-	-	≥235	≥470	≥18	-	-	-	-
Samples from pipes with a wall thickness of 10-12 mm. Normalization + Vacation
-	-	≥430	≥510	≥12	≥75	-	-	-
Rolled steel. Annealing at 840-860 °C, cooling with the furnace
≤90	-	≥215	≥390	≥22	≥50	≥1176	-	-
Long products (sample). Annealing in air from 900 °C + Vacation, air cooling
-	450	≥1020	≥1230	≥20	≥65	-	-	≥37
Samples from pipes with a wall thickness of 10-12 mm. Normalization + Vacation
-	-	≥385	≥480	≥15	≥76	-	-	-
Tubular billet on the other 14-1-583-73 after annealing
	-	≥215	≥390	≥22	≥50	≥1177	≤170	-
Long products (sample). Annealing in air from 900 °C + Vacation, air cooling
-	500	≥1120	≥1250	≥16	≥64	-	-	≥35
Samples from pipes with a wall thickness of 10-12 mm. Normalization + Vacation
-	-	≥350	≥430	≥18	≥82	-	-	-
Seamless tubes of heat-treated in the delivery condition according to GOST 550-75
	-	≥216	≥392	≥22	≥50	≥1180	≤170	-
Long products (sample). Annealing in air from 900 °C + Vacation, air cooling
-	550	≥760	≥850	≥19	≥73	-	-	≥20
Samples from pipes with a wall thickness of 10-12 mm. Normalization + Vacation
-	-	≥170	≥310	≥21	≥91	-	-	-
Seamless tubes of heat-treated in the delivery condition according to GOST 550-75
	-	≥216	≥392	≥22	-	-	≤170	-
Forgings with a diameter of 280 mm. Normalization at 1000 °C, air cooling + Vacation at 700 °C, air cooling
-	-	≥660	≥800	≥16	≥50	-	-	-
Hot deformed tubes in the delivery condition (in cross-section shows the thickness of the wall)
2-25	-	≥216	≥392	≥22	≥50	≥1158	≤170	-
Forgings with a diameter of 280 mm. Normalization at 1000 °C, air cooling + Vacation at 700 °C, air cooling
-	-	≥580	≥680	≥15	≥68	-	-	-
Hot-deformed pipes. Normalization + Tempering (in cross-section shows the thickness of the wall)
2-25	-	≥412	≥588	≥16	≥65	≥961	≤235	-
Forgings with a diameter of 280 mm. Normalization at 1000 °C, air cooling + Vacation at 700 °C, air cooling
-	-	≥550	≥670	≥15	≥65	-	-	-
Pipe kiln and communication in the delivery condition on the other 14-3-457-76 (impact strength is specified for tubes with wall thickness ≥ 12 mm and is determined for longitudinal samples)
	-	≥412	≥588	≥16	≥65	≥980	180-240	-
Forgings with a diameter of 280 mm. Normalization at 1000 °C, air cooling + Vacation at 700 °C, air cooling
-	-	≥530	≥630	≥14	≥64	-	-	-
Pipe tsentrobezhnolityh heat-treated in the delivery condition according to TU 14-3P-115-2010. Normalization: the loading in the oven at ≤ 350 °C, the temperature rise to 690-720 °C with a speed ≤ 150 °C/h (exposure 4 h), the rise of the temperature to 950-980 with a speed of ≤ 100 °C/h (exposure 2 min/1 mm of wall thickness), cooling to ≤ 100 °C air cooling fan for extended the bottom of the oven or out of the pod, then air cooling + Release: download of in the oven at ≤ 350 °C, the temperature rise to 705-735 °C at a rate of 100 °C/h (exposure 4 h), air cooling
	-	≥412	≥588	≥19	≥35	≥961	≤220	-
Forgings with a diameter of 280 mm. Normalization at 1000 °C, air cooling + Vacation at 700 °C, air cooling
-	-	≥520	≥620	≥16	≥70	-	-	-
-	-	≥465	≥550	≥19	≥75	-	-	-
-	-	≥390	≥500	≥22	≥82	-	-	-
-	-	≥300	≥415	≥22	≥84	-	-	-

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
y	The relative narrowing
KCU	Toughness
HB	Brinell hardness number
HRC	Rockwell hardness (indenter diamond spheroconical)

Physical characteristics

Temperature	Е, HPa	r, kg/m³	l, W/(m · °C)	R, Mr. · m	a, 10^-6 1/°C	С, J/(kg · °C)
20	211	7750	-	430	-	-
400	178	7640	34	-	122	-
500	145	7610	33	-	123	-
600	102	7580	-	-	123	-
100	-	7730	37	-	113	483
200	-	7700	36	-	116	-
300	-	7670	35	-	119	483
800	-	-	-	-	125	-

A description of the physical symbols

Name	Description
Е	The normal elasticity modulus
G	Modulus of elasticity shear torsion
r	Density
l	Coefficient of thermal conductivity
R	UD. the resistivity

Technological properties

Name	The value
Weldability	Difficult weldability. Method of welding: SMAW. Necessary preheating and subsequent heat treatment.
Склонность к отпускной хрупкости	Tend not.
The temperature of forging	Start - 1200 °C, the end - of 800 °C. the cross Sections up to 800 mm is subjected to annealing by recrystallization and single hypothermia.
Flock-sensitive sensitivity	Sensitive.
Machinability	In hot-rolled condition, when blower SB HB 170=390 MPa Kn TV.SPL.=Of 2.7 Kn b.St.=2,0.
Macrostructure and pollution	The macrostructure of billets, check for the etched cross templeto should not have shrinkage looseness, bubbles, delaminations, voids, cracks, inclusions and placenow visible without using the magnifying devices. The defects allowed on a point inhomogeneity, the Central porosity and segregation must not exceed 2 points (for each species), subcortical bubbles at 1 point at a depth of less than 2 mm. Permissible defects of billets of steel, ESR should not exceed 1 point (for each indicator) at the point of heterogeneity, Central porosity and segregation, subcortical bubbles are not allowed.
Features of heat treatment	Pipe kiln and communication on the other 14-3-457-76 are delivered in heat treated condition. Temperature high release pipe after normalization should not be below 700 °C.