Structural steel alloy 35X23N7SL (25H23N7SL)

Chemical composition

C	Carbon	<0.35
Si	Silicon	0.5 — 1.2
Mn	Manganese	0.50 — 0.85
P	Phosphorus	<0.035
S	Sulfur	<0.035
Cr	Chromium	21.0 — 25.0
Ni	Nickel	6.0 — 8.0
Fe	Iron	Rest

With voystva after heat treatment:

Yield Strength:> 245 MPa

Temporary resistance:> 540 MPa

Elongation:> 12%

Density — 7720 kg / m3

Production in Russia is carried out in accordance with the standards GOST 4543−81 and GOST 977−87. Steel is intended for the production of details of tube furnaces of oil refineries and other parts that are corrosion-resistant in sulfuric environments and operating at temperatures up to 1000 ° C; austenitic — ferritic steel

Classification

Country	Section	Category
Country	Section	Category
CIS, Russia, Ukraine	Steels and alloys for castings	Steel for casting with special properties

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %
Standard	Fe, %	Si, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %
GOST 977-88	64.53–72	0.5–1.2	0.5–0.85	21–25	6–8	< 0.035	< 0.35	< 0.035

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Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	Treatment
Castings	GOST 977-88				540	245	12

Heat Treatment Modes

Treatment
Treatment
Without heat treatment

Standards

Standard	Description
Standard	Description
GOST 977-88

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
Mn	%	Manganese
Cr	%	Chrome
Ni	%	Nickel
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur

Description of mechanical properties

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
$\sigma _{U}$	$MPa$	Ultimate tensile strength
$\sigma_{P}$	$MPa$	Proportionality limit
$\epsilon_L$	%	Elongation at break (longitudinal)