BOILER STEEL 25CRMO4

    1. DIN 25CrMo4 / AISI 4130 Steel  ALLOY ENGINEERING STEEL AND HIGH PRESSURRE BOILER STEEL 25CRMO4, 1.7218, AISI 4130 WITH INCREASED STRENGTH FOR CONSTRUCTION AND OPERATION AT ELEVATED TEMPERATURES.

  1. DIN 25CrMo4 / AISI 4130 Steel Specification and Relevant Standards

Country USA DIN BS Japan
Standard ASTM A29 EN 10250/EN10083 BS 970 JIS G4105
Grades 4130 25CrMo4/1.7218 708A25/708M25 SCM430

  1. DIN 25CrMo4 / ASTM 4130 Steels And Equilvalents Chemical Composition

Standard Grade C Mn P S Si Cr Mo
ASTM A29 4130 0.28-0.33 0.40-0.60 0.035 0.040 0.15-0.35 0.80-1.10 0.15-0.25
EN10250
/EN10083		 25CrMo4/
1.7218		 0.22-0.29 0.60-0.90 0.025 0.035 ≦0.40 0.90-1.2 0.15-0.30
JIS G4105 SCM430/
SCM2		 0.28-0.33 0.60-0.85 0.030 0.030 0.15-0.35 0.90-1.2 0.15-0.30

4.DIN 25CrMo4 /AISI Alloy 4130 Steel Mechanical Properties

25CrMo4 /  4130 Physical Properties

  • Density (lb / cu. in.)                                                                        0.283
  • Specific Gravity                                                                              7.8
  • Specific Heat (Btu/lb/Deg F – [32-212 Deg F])                             0.114
  • Melting Point (Deg F)                                                                     2610
  • Thermal Conductivity                                                                     22.3
  • Mean Coeff Thermal Expansion                                                     7
  • Modulus of Elasticity Tension                                                        29

DIN 25CrMo4 /AISI 4130 Steel Mechanical Properties

Properties Metric
Tensile strength, ultimate 560 MPa
Tensile strength, yield 460 MPa
Modulus of elasticity 190-210 GPa
Bulk modulus (Typical for steel) 140 GPa
Shear modulus (Typical for steel) 80 GPa
Poissons ratio 0.27-0.30
Elongation at break (in 50 mm) 21.50%
Reduction of area 59.6
Hardness, Brinell 217
Hardness, Knoop (Converted from Brinell hardness) 240
Hardness, Rockwell B (Converted from Brinell hardness) 95
Hardness, Rockwell C (Converted from Brinell hardness, value below normal HRC range, for comparison purposes only.) 17
Hardness, Vickers (Converted from Brinell hardness) 228
Machinability (Annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.) 70

Thermal Properties

Properties Metric
Thermal conductivity (100°C) 42.7 W/mK

5. DIN 25CrMo4 /AISI 4130 Steel Application

This low alloy 4130 steel is widely used in many applications, and some typical application areas are as follows:

https://otaialloysteel.com/3-steel-grades-suitable-for-making-gear/

  • Commercial aircraft, aircraft engine mounts
  • Military aircraft
  • Automotive
  • Machine tools
  • Hydraulic tools
  • Auto racing
  • Aerospace
  • Oil and gas industries – as forged valve bodies and pumps
  • Agricultural and defense industries etc.