Germany · DIN

42 CrMo 4

DIN EN 10305-1:2003 — Steel tubes for precision applications - Technical delivery conditions - Part 1: Seamless cold drawn tubes

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Standards

DIN 1652-4:1990Bright steel made from steel for quenching and tempering; technical delivery conditions
DIN 17204:1990DIN 17204
DIN 1654-4:1989DIN 1654-4
DIN 17200:1969DIN 17200
DIN EN 10083-1:1991Steels for quenching and tempering - Part 1: General technical delivery conditions; German version EN 10083-1:2006
DIN EN 10083-3:2007Steels for quenching and tempering - Part 3: Technical delivery conditions for alloy steels
DIN EN 10250-3DIN EN 10250-3
DIN EN 10343:2009Steels for quenching and tempering for construction purposes - Technical delivery conditions
DIN EN 10297-1:2003Seamless steel tubes for mechanical and general engineering purposes - Technical delivery conditions - Part 1: Non-alloy and alloy steel tubes; German version prEN 10297-1:1998
DIN EN 10269:1999Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties; German version EN 10269:1999
DIN EN 10263-4:2002Steel rod,bars and wire for cold heading and cold extrusion - Part 4: Technical dellivery conditions for steels for quenching and tempering
DIN EN 10269:2013Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties; German version EN 10269:1999
DIN EN 10132-3:2000Cold-rolled narrow steel strip for heat-treatment - Technical delivery conditions - Part 3: Steels for quenching and tempering; German version EN 10132-3:2000
DIN EN 10305-1:2003Steel tubes for precision applications - Technical delivery conditions - Part 1: Seamless cold drawn tubes
DIN EN 10083-1:1996Steels for quenching and tempering - Part 1: General technical delivery conditions; German version EN 10083-1:2006

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Chemical composition

Element	min	max
C	0.38	0.45
Cr	0.9	1.2
Mn	0.6	0.9
Mo	0.15	0.3
P		0.035
S		0.035
Si		0.4

Mechanical properties

Heat treatment / condition	Yield strength	Tensile strength	Elongation	Reduction of area	Impact energy	Hardness
Seamless tubes +C		≥720	≥4 Elongation after fracture
Seamless tubes +LC		≥670	≥6 Elongation after fracture

Physical properties

Temperature

20.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
210.00		33.50	460.00	0.19	7.85

100.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
205.00	11.10

200.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
195.00	12.10

250.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
		34.00

300.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
185.00	12.90

400.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
175.00	13.50

500.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	13.90	34.20

600.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
155.00	14.10

Typical physical values

Density	Elastic modulus	Poisson's ratio	Remarks
7.72–8.00	190.00–210.00	0.27–0.30	典型属性数值，工具钢。此值不来源于标准，它是指示性指标，不能被用于设计用途。
7.85	200.00–207.00	0.27–0.30	低碳钢低合金钢的材料性能属性数值，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.Semi Finished products; Thickness: <= 16 mm; 淬火及回火 (+QT); Reversed bending; T: 20°C; -

Test conditions

Item	Detail
Product	Semi Finished products; Thickness: <= 16 mm; +QT
Experiment	Reversed bending; T: 20°C
Specimen

Monotonic

Property	Value
Yield strength (MPa)	900.0
Tensile strength (MPa)	1000.0 1300.0
Elongation (%)	10.0
Reduction of area (%)	40.0

Stress life

No.	Cycles
1	1E7

2.钢坯; Thickness (mm): 150; Width (mm): 150; 淬火和回火; Austenitized at 860°C/30 min, oil quenched, tempered 620°C/2h; Steel produced by continuous casting; Total strain control; R=-1; Frequency: 1 Hz; T: 20°C; Cylindrical; Diameter [mm]: 55

Test conditions

Item	Detail
Product	Thickness (mm): 150; Width (mm): 150; quenched and tempered; Austenitized at 860°C/30 min oil quenched tempered 620°C/2h; Steel produced by continuous casting
Experiment	Total strain control; R=-1; Frequency: 1 Hz; T: 20°C
Specimen	Cylindrical; Diameter [mm]: 55

Monotonic

Property	Value
Elastic modulus (GPa)	249.0
Yield strength (MPa)	937.0
Tensile strength (MPa)	1090.0
Elongation (%)	16.3
Reduction of area (%)	60.0
Strength coefficient (MPa)	989.0
Strain-hardening exponent	0.011
Hardness (HV)	283.0
Metric	Ghost lines in fairly large martensitic areas immersed in a bainitic matrix

Strain life

No.	Cyclic yield strength (MPa)	Cyclic strain-hardening exponent n′	Cyclic strength coefficient K′ (MPa)	Fatigue strength coefficient σ′f (MPa)	Fatigue strength exponent b	Fatigue ductility coefficient ε′f	Fatigue ductility exponent c
1	662	0.0830	1110	1177	-0.0645	1.3022	-0.7272

Stress life

No.	Specimen	Stress (MPa)	Cycles
1	Cylindrical; Diameter [mm]: 55	462	2E6

3.钢坯; Thickness (mm): 150; Width (mm): 150; 淬火和回火; Austenitized at 860°C/30 min, oil quenched, tempered 620°C/2h; Steel produced by ingot; Total strain control; R=-1; Frequency: 1 Hz; T: 20°C; Cylindrical; Diameter [mm]: 55

Test conditions

Item	Detail
Product	Thickness (mm): 150; Width (mm): 150; quenched and tempered; Austenitized at 860°C/30 min oil quenched tempered 620°C/2h; Steel produced by ingot
Experiment	Total strain control; R=-1; Frequency: 1 Hz; T: 20°C
Specimen	Cylindrical; Diameter [mm]: 55

Monotonic

Property	Value
Elastic modulus (GPa)	249.0
Yield strength (MPa)	934.0
Tensile strength (MPa)	1088.0
Elongation (%)	16.4
Reduction of area (%)	60.0
Strength coefficient (MPa)	989.0
Strain-hardening exponent	0.011

Strain life

No.	Cyclic yield strength (MPa)	Cyclic strain-hardening exponent n′	Cyclic strength coefficient K′ (MPa)	Fatigue strength coefficient σ′f (MPa)	Fatigue strength exponent b	Fatigue ductility coefficient ε′f	Fatigue ductility exponent c
1	674	0.0940	1213	1190	-0.0649	0.7469	-0.6759

Stress life

No.	Specimen	Stress (MPa)	Cycles
1	Cylindrical; Diameter [mm]: 55	464	2E6

4.轴; Diameter (mm): 25; 淬火和回火; Total strain control; R=-1; Frequency: 0.1-11 Hz; T: 23°C; Hourglass shaped; Diameter [mm]: 6; Gauge length [mm]: 4; 方向: L

Test conditions

Item	Detail
Product	Diameter (mm): 25; quenched and tempered
Experiment	Total strain control; R=-1; Frequency: 0.1-11 Hz; T: 23°C
Specimen	Hourglass shaped; Diameter [mm]: 6; Gauge length [mm]: 4; Direction: L

Monotonic

Property	Value
Elastic modulus (GPa)	211.4
Yield strength (MPa)	998.0
Tensile strength (MPa)	1111.0
Elongation (%)	23.0
Reduction of area (%)	60.0
True fracture strength (MPa)	1525.0
True fracture ductility (%)	0.496
Strength coefficient (MPa)	1418.0
Strain-hardening exponent	0.061
Strain rate (%/min)	0.42 (%/min)

Strain life

No.	Cyclic yield strength (MPa)	Cyclic strain-hardening exponent n′	Cyclic strength coefficient K′ (MPa)	Fatigue strength coefficient σ′f (MPa)	Fatigue strength exponent b	Fatigue ductility coefficient ε′f	Fatigue ductility exponent c
1	716	0.1040	1368	1411	-0.0728	1.3833	-0.7051

Stress life

No.	Specimen	Stress (MPa)	Cycles
1	Hourglass shaped; Diameter [mm]: 6; Gauge length [mm]: 4; Direction: L	490	2E6

5.正火; 930°C/3h炉; Total strain control; R=-1; Frequency: 0.5-5 Hz; T: 23°C; Cylindrical; Diameter [mm]: 6; Gauge length [mm]: 14; 方向: L

Test conditions

Item	Detail
Product	normalized; 930°C/3h
Experiment	Total strain control; R=-1; Frequency: 0.5-5 Hz; T: 23°C
Specimen	Cylindrical; Diameter [mm]: 6; Gauge length [mm]: 14; Direction: L

Monotonic

Property	Value
Elastic modulus (GPa)	190.5
Yield strength (MPa)	400.0
Tensile strength (MPa)	740.0
Elongation (%)	19.0
Strength coefficient (MPa)	549.0
Strain-hardening exponent	0.038
Strain rate (%/min)	1.5 (%/min)
Hardness (HV)	230.0

Strain life

No.	Cyclic yield strength (MPa)	Cyclic strain-hardening exponent n′	Cyclic strength coefficient K′ (MPa)	Fatigue strength coefficient σ′f (MPa)	Fatigue strength exponent b	Fatigue ductility coefficient ε′f	Fatigue ductility exponent c
1	328	0.1150	673	1002	-0.1111	749.7001	-1.2796

Stress life

No.	Specimen	Stress (MPa)	Cycles
1	Cylindrical; Diameter [mm]: 6; Gauge length [mm]: 14; Direction: L	200	2E6

Heat treatment

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

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