40X13 (4Х13)

Cutting, measuring, surgical tools, springs, carburetor needles, household items, valve plates of compressors. Steel does not weld.

spring for operation at temperatures up to 400−450 degrees. Springs, ball bearings, cutting and measuring tools; martensitic steel grade

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

Standard	Fe, %	Si, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %
Standard	Fe, %	Si, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %
GOST 5632-72	83.705–87.65	< 0.6	< 0.6	12–14	< 0.6	< 0.03	0.35–0.44	< 0.025

Temperature, °C	$E\cdot 10^{9}$ , $MPa$	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$	$c\cdot 10^{-3}$ , $\frac{J}{kg\cdot K}$	$R\cdot 10^{-6}$ , $\Omega\cdot m$
Temperature, °C	$E\cdot 10^{9}$ , $MPa$	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$	$c\cdot 10^{-3}$ , $\frac{J}{kg\cdot K}$	$R\cdot 10^{-6}$ , $\Omega\cdot m$
20	218		25	7650	0.461	0.59
100	214	10.8	26	7630	0.482	0.65
200	206	11.9	27.2	7600	0.523	0.71
300	198	12.3	28.3	7570	0.565	0.79
400	188	13	29.1	7540	0.607	0.86
500	176	13.6	29.1	7510	0.674	0.94
600	163	13.5	29.1	7480	0.775	1
700	148	13.8	28.3	7450	0.988	1.12
800	140	14.6	27.9	7420	0.825	1.18
900			28.5		0.691	1.16

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\epsilon_L$ , %	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\epsilon_L$ , %	Treatment
Sheet	GOST 5582-75				550	15	Annealing 740-800 ° C
Bar of specified strength	GOST 18907-73				590–810	10
Wire	GOST 18143-72				640–880	10–14

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
Alloy		Hardening, average vacation	460–550
Rod	GOST 5949-75	annealing	143–229

Weldability
Weldability
Not applicable for welded structures

Ac₁, K	Ar₁, K
Ac₁, K	Ar₁, K
800	780

USA	Germany
USA	Germany
420	1.4031 (X39Cr13)

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
$E\cdot 10^{9}$	$MPa$	Elastic modulus
$\alpha\cdot 10^{6}$	$K^{-1}$	Coefficient of thermal (linear) expansion (range 20°C–T)
$\varkappa$	$\frac{W}{m\cdot K}$	Coefficient of thermal conductivity (the heat capacity of the material)
$\rho$	$\frac{kg}{m^3}$	The density of the material
$c\cdot 10^{-3}$	$\frac{J}{kg\cdot K}$	The specific heat of the material (range 20°C–T)
$R\cdot 10^{-6}$	$\Omega\cdot m$	Electrical resistivity

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

Parameter	Units of measurement	Description
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