03Х11Н10М2Т1 steel is used: for the production of highly loaded parts of turbine, gears, spindles, working in temperature range from cryogenic to +500 °C.

Note

High-strength corrosion-resistant Maraging steel.

Standards

Name	Code	Standards
Blanks. Of the workpiece. Slabs	В31	TU 14-1-1046-74, TU 14-1-3072-80
Processing of metals by pressure. Forgings	В03	TU 14-1-2100-77, TU 14-1-5285-94
Sheets and strips	В33	TU 14-1-2519-78, TU 14-1-5132-92
Bars and shapes	В32	TU 14-1-4608-89

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	Al	B	Ti	Mo	Nb	Zr
TU 14-1-5285-94	≤0.03	≤0.01	≤0.01	≤0.1	10-11.3	≤0.15	9-10.3	Rest	-	≤0.2	0.003	1-1.4	1.8-2.3	≤0.15	0.03
TU 14-1-4608-89	≤0.03	≤0.01	≤0.01	≤0.1	10-11.3	≤0.15	9-10.3	Rest	≤0.3	≤0.2	0.002	1-1.4	1.8-2.3	≤0.15	0.06

Fe is the basis.
According to TU 14-1-4608-89 the chemical composition is given for steel grade 03H11N10M2T1-VD (EP679-VD). Boron and zirconium are introduced into the metal by calculation without taking into account the burn and chemical analysis is not determined. Deviations from the chemical composition are permissible: carbon +0.0050%, chromium ± 0.20%, nickel -0.20%. Deviations in sulfur and phosphorus are allowed, provided that the total mass fraction does not exceed 0.022%, and also for silicon and manganese, provided that the total mass fraction does not exceed 0.30%.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²
Bars hot rolled and forged THAT 14-1-4608-89. Group 1. The longitudinal samples. Bars up to 100 mm: Hardened in air or in water 950-980 °C + Aging at 500-520 °C (extract to 4.0-4.5 hours), air cooling; Rods over 100 mm: Triple tempering in air or in water 950-980 °C (40 minutes exposure) + Aging at 500-520 °C (extract to 4.0-4.5 hours), air cooling
	≥1270	≥1370	≥8	≥35	≥343

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

Technological properties

Name	The value
Macrostructure and pollution	Pollution steel non-metallic inclusions estimated average score on the methods and scales GOST 1778 (SH1 Ш4 or method) and should not exceed: nitride inclusions - 3.0 points, silicates, non-deformed - 2.5 points, other types of inclusions - 1.0 points. The surface quality and macrostructure must meet the requirements of GOST 5949.

Steel 03Х11Н10М2Т1 (ЭП679)

Designation

Description