DIN 42CrMo4 1.7225,ASTM 4140 High Tensile Steel Bar

DIN 42CrMo4 1.7225,ASTM 4140 High Tensile Steel Bar

Introduction

DIN 42CrMo4 1.7225 ASTM 4140 Hot Rolled High Tensile Steel Bar, generally supplied hardened and tempered to Condition “T” in sections up to 100mm, with a tensile strength of 850 – 1000 MPa and aiming for this strength range in larger sections. It offers a very good balance of strength, toughness and wearresistance.

Application

Alloyed heat treatable steel with a typical tensile strength of 900 -1200 N/mm². For automotive and aircraft components with high toughness as axle journals, gears, tyres, push rods. And Axles, conveyor parts, crow bars, gears, logging parts, spindles, shafts, sprockets, studs, pinions, pump shafts, rams, ring gears, etc.

Quality Standard

ASTM A29 Standard for Steel Bars, Carbon and Alloy, Hot-Wrought, General Requirements.

All Grades Comparison

ASTM                                         EN                                                JIS                                    GB

4140                                 42CrMo4/1.7225                           SCM440TK                        42CrMo

Chemical Composition(%)

Steel Grade            C                  Si                  Mn               P                 S                   Cr                      Mo

4140                 0.38-0.43     0.15-0.35     0.75-1.00    0.040 max    0.040 max       0.80-1.10      0.15-0.25

42CrMo4         0.38-0.45     0.40 max     0.60-0.90    0.025 max    0.035 max       0.90-1.20      0.15-0.30

SCM440TK      0.38-0.43     0.15-0.35      0.60-0.90    0.030 max    0.030 max       0.90-1.20      0.15-0.30

42CrMo          0.38-0.45     0.17-0.37      0.50-0.80    0.030 max    0.030 max       0.90-1.20      0.15-0.25

Mechanical Properties

Heat Treatment
Forging: Heat to 1150°C Hold until uniform.Minimum forging temperature 850°C. Cool slowly in ashes or sand etc.
Annealing: Heat to 830°C – 850°C. Cool in furnace.
Normalising: Heat to 870°C – 900°C. Cool in still air.
Stress Relieving:
Annealed: Heat to 600°C – 650°C.
Hardened: Heat to 500°C – 550°C. Cool in still air.
Hardening: Heat to 830°C – 880°C. Quench in oil or polymer.
Tempering: Heat to 450°C – 700°C cool in still air.

Capacity

3,000 ton per month.

Test

Chemical Composition, Mechanical Property, Hardness testing, Ultrasonic testing, Magnetic testing, Metallographic, Dimension and Surface.

Package

Each bundle of max 3,000kg with several steel strips, Two tags on each bundle.

Mill’s Test Certificate

EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.