Steel 35K

No foreign analogues

It is used in the manufacture of bottoms, flanges, forged and welded drums of steam boilers. couplings, nozzles and other parts operating at temperatures from -40 to 500 ° C under pressure

Classification

Country	Section	Category
CIS, Russia, Ukraine	Corrosion-resistant alloys and steels	Corrosion-resistant ordinary steel

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Co, %	Cr, %	Ni, %	P, %	C, %	S, %
GOST 4543-71	61.61–64.66	< 0.4	0.5–0.8	34.5–35.5	< 0.3	< 0.4	< 0.035	0.32–0.92	0.02–0.035

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Physical characteristics

Temperature, °C	$$E\cdot 10^{9}$$, $$MPa$$	$$\varkappa$$, $$\frac{W}{m\cdot K}$$	$$\rho$$, $$\frac{kg}{m^3}$$	Cp, Дж/кг·К
20	206	52	8180	460

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$$\sigma _{U}$$, $$MPa$$	$$\sigma_{Y}$$, $$MPa$$	d5, %	Treatment
Sheet	GOST 4543-71	60	Transverse		550–600	280–300	20

Твёрдость по Роквеллу

Rolling	Standard	Classifiers	Value, HRC
Round	GOST 4543-71		32–37

Technological Properties

Weldability	Flake Susceptibility	Propensity to temper brittleness
Difficult to weld	insensitive	loathsome

Critical point temperatures

Ac₁, K	Ar₁, K
730	690

Limit operating modes

Standard	Температура, °C
GOST 4543-71	< 450

Heat Treatment Modes

Treatment
Normalization 940 - 960oC, tempering 630 - 650oC, air cooling, 65 oC / h

Properties

Property
Normalization 940 - 960oC, Holidays 630 - 650oC, Air cooling, 65 oC / h

Standards

Standard	Description
GOST 4543-71

Description of chemical elements

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

Description of physical characteristics

Parameter	Units of measurement	Description
Cp	Дж/кг·К	Specific heat of material
$$E\cdot 10^{9}$$	$$MPa$$	Elastic modulus
$$\varkappa$$	$$\frac{W}{m\cdot K}$$	Coefficient of thermal conductivity (the heat capacity of the material)
$$\rho$$	$$\frac{kg}{m^3}$$	The density of the material

Description of mechanical properties

Parameter	Units of measurement	Description
d5	%	Elongation at break
$$\sigma_{Y}$$	$$MPa$$	Yield strength
$$\sigma _{U}$$	$$MPa$$	Ultimate tensile strength

Designation of types of weldability

Parameter	Units of measurement	Description
no limits		Welding is performed without heating and without subsequent heat treatment
Boundedly welded		Welding is possible with heating up to 100–120 °C and subsequent heat treatment
Difficult to weld		For obtaining quality welded joints, additional operations are required: heating up to 200–300 °C for welding, heat treatment after welding — annealing
Not applicable for welded structures

Description of temperatures of critical points

Parameter	Units of measurement	Description
Ac₁	K
Ar₁	K