Italy · UNI

X 20 Cr 13

UNI 6904:1971 — UNI 6904

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Standards

UNI EN 10088-3Stainless steels. Technical delivery conditions for semi-finished products, bars, rods and sections for general purposes.
UNI EN 10088-5UNI EN 10088-5Stainless steels. Part 5:Technical delivery conditions for bars,rods,wire,sections and bright products of corrosion resisting steels for construction purposes
UNI EN 10088-2UNI EN 10088-2
UNI EN 10088-4Stainless steels. Part 4:Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for construction purposes
UNI EN 10250-4Open die steel forgings for general engineering purposes - Part 4 : stainless steels
UNI 6901:1971UNI 6901
UNI 6904:1971UNI 6904
UNI EN 10151Stainless steel strip for springs; technical delivery conditions
UNI 6900:1971UNI 6900
UNI EN 10088-1Stainless steels—Part 1:List of stainless steels

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Chemical composition

Element	min	max
C	0.16	0.25
Cr	12	14
Mn		1
Ni		1
P		0.04
S		0.03
Si		1

Mechanical properties

Heat treatment / condition	Yield strength	Tensile strength	Elongation	Reduction of area	Impact energy	Hardness
Seamless tubes, quenched and tempered	≥590	735–930	≥13
Seamless tubes, annealed						HR ≤97 HRB；HB ≤220 HRB

Physical properties

Temperature

20.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
215.00；216.00；210.00；220.00		30.00；25.10	460.00	0.60	7.70

100.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
212.00；213.00	10.50

200.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
205.00；207.00	11.00	26.50	500.00	0.69

300.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
200.00	11.50

400.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
190.00；192.00	12.00	27.70	590.00	0.86

500.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	12.00

600.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
		27.40	720.00	1.03

800.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
		25.00	860.00	1.17

Typical physical values

Density	Elastic modulus	Poisson's ratio	Remarks
7.61–8.10	190.00–215.00	0.27–0.30	不锈钢的典型材料性能数值，此值不来源于标准，它是指示性指标，不能被用于设计用途。
7.86	190.00–210.00	0.27–0.30	低碳，高合金钢材料性能属性数值，此值不来源于标准，它是指示性指标，不能被用于设计用途。

Fatigue

Condition

1.锻件; Thickness: <= 160mm; 淬火及回火 (QT700); Reversed bending; T: 20°C; -

Test conditions

Item	Detail
Product	forging; Thickness: <= 160mm; +QT700
Experiment	Reversed bending; T: 20°C
Specimen

Monotonic

Property	Value
Yield strength (MPa)	500.0
Tensile strength (MPa)	700.0 850.0
Elongation (%)	13.0

Stress life

No.	Cycles
1	1E7

Item	Detail
Product	forging; Thickness: <= 160 mm; +QT800
Experiment	Reversed bending; T: 20°C
Specimen

Property	Value
Yield strength (MPa)	600.0
Tensile strength (MPa)	800.0 950.0
Elongation (%)	12.0

Heat treatment

Type	1
Heat-treatment curve	Hardness-Tempering
Heat-treatment curve	CCT modified
Heat-treatment curve	CCT
Heat-treatment curve	TTT

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