A507 A29 ASTM 4118 Alloy Structural Steel UNS G41180 High Yield Strength Toughness
ASTM 4118 Alloy Structural Steel 6.0mm-1200mm Very High Strength And Toughness
ASTM4118 has high hardenability, no temper brittleness, good weldability, little tendency to form cold crack, good machinability and cold strain plasticity. ASTM4118 is generally used in quenched and tempered or carburized and quenched conditions, and is used to manufacture high-pressure pipes and various fasteners, and higher carburized parts, such as gears and shafts, which work in non-corrosive media and media with a working temperature of less than 250 ℃ and containing nitrogen and hydrogen mixture.
Supply Form & Size
| Form of Supply | Size(mm) | Length(mm) |
| Round bar | 6.0mm-1200mm | 2.5m-10m |
Chemical Composition&Related Specifications
| Grade | C | Si | Mn | P | S | Cr | Mo |
| 4118 | 0.18～0.23 | 0.15～0.35 | 0.70～0.90 | ≤0.035 | ≤0.040 | 0.40～0.60 | 0.08～0.15 |
Brand comparison table
| AISI/SAE | DIN/EN | BS | JIS/KS | China |
| 4118 | 18CrMo4(1.7243) | 18CrMo4(1.7243) | SCM420 | 20CrMo |
Mechanical Property
|
tensile strength σb (MPa) |
≥885(90) |
|
yield strengthσs (MPa) |
≥685(70) |
|
elongation δ5 (%) |
≥12 |
|
Reduction of area ψ (%) |
≥50 |
| Impact energy Akv (J) | ≥78 |
| Impact toughness value αkv (J/cm2) | ≥98(10) |
|
hardness |
≤197HB |
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