ASTM A322 4140 42CrMo SCM440 Alloy Steel Seamless Steel Pipe For Boiler

Material: 4140 42CrMo SCM440

Standard: ASTM A322

4140 (42CrMo) seamless steel pipe is an ultra-high-strength steel with high strength and toughness, and good hardenability.

Chemical Composition

Product Feature

4140(42CrMo)steel is ultra-high-strength steel with high strength and toughness, good hardenability, no obvious temper brittleness, small deformation during quenching, high fatigue limit and multiple impact resistance after quenching and tempering treatment. Good impact toughness at low temperature, high creep strength and lasting strength at high temperature. The steel is usually quenched and tempered after surface quenching as a heat treatment scheme.

Heat Treatment

The heating temperature is 1150 ~ 1200°C, the starting temperature is 1130 ~ 1180°C, the end temperature is > 850°C, and when φ> 50mm, slow cooling.
Normalizing Specification
The normalizing temperature is 850~900°C, and the oven is air-cooled.
High temperature tempering specification
The tempering temperature is 680~700°C, and the furnace is air-cooled.
Quenching and Tempering Specification(Q+T)
Preheating temperature 680~700°C, quenching temperature 840~880°C, oil cooling, tempering temperature 580°C, water cooling or oil cooling, hardness ≤217HBW.
Sub-temperature quenching and toughening treatment Specification
Quenching temperature 900°C, tempering temperature 560°C, hardness (37±1) HRC
Induction hardening and tempering specification
Quenching temperature 900°C, tempering temperature 150~180°C, hardness 54~60HRC

Application

1. Fluid
2. Boiler
3. High pressure for boiler
4. High pressure for fertilizer equipment
5. Geological drilling
6. Oil drilling
7. Oil cracking
8. Special for oil drill collars
9. Automobile axle shafts
10. Ships

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