Germany · DIN

42 CrMo 4

DIN EN 10297-1:2003 — Seamless 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

Chemical composition

wt% · log scale
0.010.1110C0.38 – 0.45Cr0.9 – 1.2Mn0.6 – 0.9Mo0.15 – 0.3P0.035S0.035Si0.4
  • min – max range
  • typical value

Mechanical properties

value range by condition
Yield strength Rp0.2≥900 MPaTensile strength Rm≥1100 MPaImpact energy Kv/Ku≥30 JElongation A≥10 %Seamless tubes +QT, <= 8 mmYield strength Rp0.2≥650 MPaTensile strength Rm≥900 MPaElongation A≥12 %Seamless tubes +QT, > 20 <= 50 mmYield strength Rp0.2≥550 MPaTensile strength Rm≥800 MPaElongation A≥13 %Seamless tubes +QT, > 50 <= 80 mmImpact energy Kv/Ku≥35 JSeamless tubes +QT, > 8 <= 100 mm

Physical properties

vs. temperature
Elastic modulus GPa
155 – 210°C
Mean thermal expansion 10⁻⁶/K
11.1 – 14.1°C
Thermal conductivity W/(m·K)
33.5 – 34.2°C

Fatigue S-N curve

stress vs. cycles (log)
165255345435525110Cycles
  • 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
  • 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
  • 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
  • 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

Chemical composition

ElementminmaxSimilarRemarks
C0.380.45
Cr0.91.2
Mn0.60.9
Mo0.150.3
P0.035
S0.035
Si0.4

Mechanical properties

Heat treatment / conditionYield strengthTensile strengthElongationReduction of areaImpact energyHardness
Seamless tubes +QT, <= 8 mm≥900≥1100≥10 long. test≥30 Charpy V Notch (20°C)
Seamless tubes +QT, > 20 <= 50 mm≥650≥900≥12 long. test
Seamless tubes +QT, > 50 <= 80 mm≥550≥800≥13 long. test
Seamless tubes +QT, > 8 <= 100 mm≥35 Charpy V Notch (20°C)
Seamless tubes +QT, > 8 <= 20 mm≥750≥1000≥11 long. test
Seamless tubes +AHB ≤241

Physical properties

20.0

Elastic modulusMean thermal expansionThermal conductivitySpecific heatResistivityDensityPoisson's ratio
210.0033.50460.000.197.85

Typical physical values

DensityElastic modulusPoisson's ratioRemarks
7.72–8.00190.00–210.000.27–0.30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。
7.85200.00–207.000.27–0.30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

1.Semi Finished products; Thickness: <= 16 mm; 淬火及回火 (+QT); Reversed bending; T: 20°C; -

Test conditions
ItemDetail
ProductSemi Finished products; Thickness: <= 16 mm; +QT
ExperimentReversed bending; T: 20°C
Specimen
Monotonic
PropertyValue
Yield strength (MPa)900.0
Tensile strength (MPa)1000.0 1300.0
Elongation (%)10.0
Reduction of area (%)40.0
Stress life
No.Cycles
11E7

Heat treatment

Type1
Heat-treatment curveCCT modified
Heat-treatment curveHardness-Tempering
Heat-treatment curveCCT
Heat-treatment curveTTT
Heat-treatment curve淬透性

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