25ХН3МФА steel is used: for the manufacture of forgings of various parts of General engineering; billets of shafts of gas turbine rotors and turbine generators; backup rolls of rolling mills.

Standards

Name	Code	Standards
Blanks. Of the workpiece. Slabs	В31	TU 108.11.943-87, TU 108.11.945-87
Processing of metals by pressure. Forgings	В03	TU 3-896-78, TU 108.11.931-87, TU 108-11-38-76, TU 108.11.917-87

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Mo
TU 3-896-78	0.22-0.3	≤0.025	≤0.025	0.25-0.5	1.4-1.8	0.17-0.37	3-3.75	Rest	≤0.2	0.08-0.15	0.3-0.5
TU 108.11.917-87	0.2-0.25	≤0.02	≤0.02	0.25-0.5	1.4-1.8	≤0.37	3-3.75	Rest	≤0.3	0.08-0.15	0.3-0.5

Fe is the basis.
According to TU 3-896-78 the chemical composition is given for the rotary grade steel 25ХН3МФАР.
According to TU 108.11.917-87 the chemical composition is given for steel grade 25ХН3МФА. The total content of phosphorus and sulfur should be ≤ 0.035%. According to TU 108.11.917-87, after processing the steel on the OSRV, a limitation on the sulfur content ≤ 0.015% and phosphorus ≤ 0.015% is introduced. The total content of sulfur and phosphorus after OSRV ≤ 0.020%.

Mechanical properties

s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²
Forged billet rotors of turbine generators, thermal power plants up to 500 MW III-VI categories on the other 3-896-78 (indicate the cutting direction of sample)
≥540	≥687	≥19	≥55	≥1177
≥540	≥687	≥17	≥45	≥785
≥638	≥785	≥18	≥55	≥981
≥638	≥785	≥17	≥45	≥687

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

Steel 25ХН3МФА (25ХН3МФАР)

Designation

Description

Standards

Chemical composition

Mechanical properties

Description mechanical marks

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