15ХФА steel is used: for the manufacture of small parts subjected to carburizing and quenching and low tempering (gears, piston pins, camshaft rollers, plungers, copiers); tubes for plants of chemical and petrochemical plants with nominal pressure PN=19.6−98 MPa (200−1000 kgf/cm²); seamless hot-deformed pipes with improved corrosion and cold-resistance (article 15ХФА), with an outer diameter from 60 to 426 mm, strength class not less than K52, infield pipelines, transporting products of oil wells (pipelines and pressure pipelines at pressures up to 4.6 MPa, flow lines, production wells and oil-gathering system at pressures up to 6.5 MPa).

Note

The structural quality chrome vanadium steel.
Structural alloy steel of high corrosion resistance and cold-resistance.

Standards

Name	Code	Standards
Sheets and strips	В23	GOST 103-2006
Bars and shapes	В22	GOST 1133-71, GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Bars and shapes	В32	GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 10702-78, GOST 14955-77, TU 14-1-2118-77, TU 14-136-326-88, TU 14-11-245-88, TU 14-1-5228-93, TU 14-136-367-2008
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, TU 14-1-4944-90
Steel pipes and fittings to them	В62	TU 14-3-251-74, TU 1317-006.1-593377520-2003
Tape	В34	TU 14-4-95-72

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	N	Al	V	Ti	Mo	W
GOST 4543-71	0.12-0.18	≤0.035	≤0.035	0.4-0.7	0.8-1.1	0.17-0.37	≤0.3	Rest	≤0.3	-	-	0.06-0.12	≤0.03	≤0.15	≤0.2
TU 1317-006.1-593377520-2003	0.13-0.17	≤0.015	≤0.015	0.4-0.65	0.5-0.7	0.17-0.37	≤0.2	Rest	≤0.2	≤0.008	0.02-0.05	0.04-0.09	-	-	-
GOST 10702-78	0.12-0.18	≤0.035	≤0.035	0.4-0.7	0.8-1.1	≤0.2	≤0.3	Rest	≤0.3	-	-	0.06-0.12	≤0.03	≤0.15	≤0.2

Fe is the basis.
According to GOST 4543-71 the chemical composition is given for steel grade 15HF. For 15ХФА steel, the content in high-quality steel is regulated: P≤0,025%; S≤0.025%; Сu≤0.30%; in high-grade steel: P≤0,025%; S≤0.015%; Сu≤0.25%. In accordance with the order, the content of Si = 0.10-0.37% can be established.
According to TU 1317-006.1-593377520-2003 the chemical composition is given for steel grade 15HFA. 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%.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	d₁₀	y, %	KCU, kJ/m²	HB, MPa	HRC	HRB
Hot-rolled steel and hot rolled with special surface finish
-	-	-	-	-	-	-	≤163	-	-
Steel calibrated and calibrated with special surface finish
-	-	-	-	-	-	-	≤207	-	-
-	-	≤540	-	-	≥55	-	≤187	-	-
-	-	≤490	-	-	≥55	-	≤187	-	-
Rolled steel. Quenching in oil or water from 880 °C to + Quenching in oil or water with 760-810 °C + Vacation at 180 °C, air cooling or oil
15	≥540	≥730	≥13	-	≥50	≥765	-	-	-
Sample diameter 10 mm, length 100 mm. Annealing. The speed of the grips of the testing machine of 0.4-0.5 mm/min.
-	-	≥57	-	≥23	≥62	-	-	-	-
Rolled steel. Carburizing at 930 °C (exposure 12 h) + Quenching in oil from 875 °C + Quenching in oil from 840 °C to + Vacation at 200 °C
25	720-760	960-980	9-12	-	50-58	765-961	-	59-63	-
Sample diameter 10 mm, length 100 mm. Annealing. The speed of the grips of the testing machine of 0.4-0.5 mm/min.
-	-	≥47	-	≥26	≥34	-	-	-	-
Rolled steel. Carburizing at 930 °C (exposure 12 h) + Normalization at 875 °C, air cooling + Quenching in oil from 800 °C + Vacation at 200 °C
25	350-380	610-690	16-20	-	43-55	579-961	-	59-63	-
Sample diameter 10 mm, length 100 mm. Annealing. The speed of the grips of the testing machine of 0.4-0.5 mm/min.
-	-	≥32	-	≥43	≥68	-	-	-	-
Seamless tubes gas & oil heat-treated in the delivery condition on the other 1317-006.1-593377520-2003 (samples in the delivery condition specified strength class, in the column the value is KCU KCV-50 °C)
60-426	372-491	≥510	≥23	-	-	≥980	-	-	≤92
Sample diameter 10 mm, length 100 mm. Annealing. The speed of the grips of the testing machine of 0.4-0.5 mm/min.
-	-	≥24	-	≥47	≥94	-	-	-	-
-	-	≥19	-	≥60	≥99	-	-	-	-

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
d₁₀	Elongation after rupture
y	The relative narrowing
KCU	Toughness
HB	Brinell hardness number
HRC	Rockwell hardness (indenter diamond spheroconical)
HRB	Rockwell hardness (indenter steel, spherical)

Physical characteristics

Temperature	Е, HPa	r, kg/m³	l, W/(m · °C)	R, Mr. · m	a, 10^-6 1/°C
0	206	7760	-	-	-
20	206	7760	-	-	-
100	-	7730	43	281	119
200	-	7710	42	345	124
300	-	7670	42	421	131
400	-	7640	40	513	137
700	-	7530	30	833	145
900	-	-	-	-	149

A description of the physical symbols

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

Technological properties

Name	The value
Weldability	Welded the CCC, without limitation, RDS - heating and subsequent heat treatment.
Склонность к отпускной хрупкости	Malosolone.
The temperature of forging	Start - 1250 °C, the end - of 800 °C. Forging a cross section of more than 60 mm are cooled slowly.
Flock-sensitive sensitivity	Insensitive.
Corrosion resistance	In the medium H2S: speed General corrosion ≤ 0.3 mm/year; resistance to hydrogen cracking in the CLR ≤ 1 % CTR ≤ 2 %; resistance to sulfide corrosion cracking with voltage ≥ 75 % of σ0,2.

Steel 15ХФА (15KHF)

Designation

Description