Italy · UNI

X 5 CrNi 18 10

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 10028-7Prodotti piani di acciai per recipienti a pressione - Acciai inossidabili
UNI EN 10088-2UNI EN 10088-2
UNI EN 10263-5Steel rod,bars and steel wire for cold heading and cold extrusion. Technical delivery conditions for stainless steels
UNI EN 10264-4:2002Filo di acciaio e relativi prodotti - Filo di acciaio per funi - Parte 4: Filo di acciaio inossidabile
UNI EN 10088-4Stainless steels. Part 4:Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for construction purposes
UNI EN 10151Stainless steel strip for springs; technical delivery conditions
UNI EN 10272Stainless steel bars for pressure purposes
UNI EN 10269Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties.
UNI EN 10250-4Open die steel forgings for general engineering purposes - Part 4 : stainless steels
UNI EN 10217-7Tubi saldati di acciaio per impieghi a pressione - Condizioni tecniche di fornitura - Parte 7: Tubi di acciaio inossidabile
UNI EN 10222-5Steel forgings for pressure purposes. Martensitic,austenitic and austenitic- ferritic stainless steels
UNI 7500:1975UNI 7500
UNI EN 10253-4Butt-welding pipe fittings. Part 4:Wrought austenitic and austenitic- ferritic(duplex) stainless steels with specific inspection requirements
UNI 6901:1971UNI 6901
UNI EN 10216-5:2004Tubi di acciaio senza saldatura per impieghi a pressione - Condizioni tecniche di fornitura - Parte 5: Tubi di acciaio inossidabile
UNI 6904:1971UNI 6904
UNI EN 10253-3Butt-welding pipe fittings - Part 3: Wrought austenitic and austenitic-ferritic (duplex) stainless steels without specific inspection requirements
UNI 8317:1981UNI 8317
UNI EN 10296-2:2005Welded circular steel tubes for mechanical and general engineering purposes. Technical delivery conditions. Part 2:Stainless steel
UNI EN 10297-2:2005Seamless steel tubes for mechanical and general engineering purposes - Technical delivery conditions - Part 2: Stainless steel
UNI 8366:1982UNI 8366
UNI EN 10088-1Stainless steels—Part 1:List of stainless steels
UNI 6900:1971UNI 6900

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Chemical composition

Element	min	max
C		0.06
Cr	18	20
Mn		2
Ni	8	12
P		0.04
S		0.03
Si		0.75

Mechanical properties

Heat treatment / condition	Yield strength	Tensile strength	Elongation	Reduction of area	Impact energy	Hardness
Seamless tubes, solution treated	≥225	490–685	≥40			HR ≤94 HRB；HB ≤202 HRB

Physical properties

Temperature

-200.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
209.00

-125.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
204.00

-75.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
201.00

20.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
200.00；193.00；185.00；195.00；190.00	15.30	15.00；14.80	500.00	0.73；0.72	7.90；7.93；8.03	0.31

25.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
195.00

50.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	15.60	15.30

75.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	15.90	15.80

100.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
194.00；189.00	16.00；17.20；16.20	16.30；16.20		0.78

125.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	16.40	16.60

150.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
186.00	16.60	17.00

175.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	16.80	17.50

200.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
186.00；183.00	16.50；17.60；17.00	17.50；17.90	510.00	0.86

225.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	17.20	18.30

250.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
179.00	17.40	18.60

275.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	17.50	19.00

300.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
179.00；176.00	17.00；17.80；17.70	19.40

325.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	17.80	19.80

350.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
172.00	17.90	20.10

375.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	18.00	20.50

400.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
172.00；169.00	17.50；18.00；18.10	19.90；20.80	550.00	1.00

425.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	18.20	21.20

450.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	18.30	21.50

475.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	18.40	21.90

500.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
165.00；160.00	18.00；18.20；18.40	21.50；22.20

525.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	18.50	22.60

550.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
156.00	18.60	22.90

575.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	18.70	23.30

600.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
154.00；151.00	18.60；18.80	22.50；23.60	585.00	1.11

625.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	18.90	24.00

650.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
146.00	19.00	24.30

675.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	19.10	24.70

700.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
140.00	19.20	25.00

725.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	19.30	25.40

750.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	19.40	25.70

775.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	19.40

800.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
127.00	19.40	25.10	630.00	1.21

825.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	19.40

900.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
				1.26

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

Test conditions

Item	Detail
Product	Semi Finished products; Thickness: <= 160 mm; Quenched
Experiment	Reversed bending; T: 20°C
Specimen

Monotonic

Property	Value
Yield strength (MPa)	190.0
Tensile strength (MPa)	500.0 700.0
Elongation (%)	35.0

Stress life

No.	Cycles
1	1E7

Creep

Temperature ℃	Time h	CRS
550	100000.0h	115.0
600	100000.0h	75.0
650	100000.0h	45.0
700	100000.0h	22.5
750	100000.0h	11.7
800	100000.0h	6.8

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