Hot Rolled 20-420mm Steel Round Bar DIN1.7225 42CrMo / 4140 42CrMo4 Q+T SCM440

42CrMo4 +QT Steel (1.7225 Material)

42CrMo4 material (1.7225 steel) is an European standard alloy steel, the delivery condition of this steel is mostly tempered and quenched, it has high strength, high toughness, good hardenability, temper brittleness, high fatigue limit, good impact resistance after quenching and tempering, and good low temperature impact toughness. This steel is suitable for the manufacture of large and medium-sized plastic molds requiring a certain degree of strength and toughness, transmission gears, rear axles, load-carrying connecting rods, spring clips and oil deep well drill pipe joints.

42CrMo4+QT means this material is in the quenched and tempered condition (+QT).

42CrMo4 Steel Datasheet and Specification

1.7225 Material, 42CrMo4 Chemical Composition

The following table shows 42CrMo4 material chemical composition.

42CrMo4 (1.7225) Material Mechanical Properties

42CrMo4 steel properties at room temperature in the quenched and tempered condition.

• Yield strength: ≥900 N/mm2 (d≤16mm, t≤8mm)
  • ≥750 N/mm2 (16 < d ≤ 40mm, 8 < t ≤ 20mm)
  • ≥900 N/mm2 (40 < d ≤ 100mm, 20 < t ≤ 60mm)
  • ≥900 N/mm2 (100 < d ≤ 160mm, 60 < t ≤ 100mm)
  • ≥900 N/mm2 (160 < d ≤ 250mm, 100 < t ≤ 160mm)
• Tensile strength: 1100-1300 N/mm2 (d≤16mm, t≤8mm)
  • 1000-1200 N/mm2 (16 < d ≤ 40mm, 8 < t ≤ 20mm)
  • 900-1100 N/mm2 (40 < d ≤ 100mm, 20 < t ≤ 60mm)
  • 850-950 N/mm2 (100 < d ≤ 160mm, 60 < t ≤ 100mm)
  • 750-900 N/mm2 (160 < d ≤ 250mm, 100 < t ≤ 160mm)
• Elongation: ≥ 10% (d≤16mm, t≤8mm)
  • ≥11% (16 < d ≤ 40mm, 8 < t ≤ 20mm)
  • ≥12% (40 < d ≤ 100mm, 20 < t ≤ 60mm)
  • ≥13% (100 < d ≤ 160mm, 60 < t ≤ 100mm)
  • ≥14% (160 < d ≤ 250mm, 100 < t ≤ 160mm)
• Impact strength of longitudinal Charpy-V-notch test: ≥35J (16 < d ≤ 250mm, 8 < t ≤ 160mm)
• 42CrMo4+QT hardness in HRC: ≥53 (after flame or induction hardening)
• 42CrMo4 hardness in HBW: ≤255 (treated to improve shearability); ≤241 (soft annealed)

Notes:

• (d) – diameter of ruling section
• (t) – thickness of flat products
• 1 MPa = 1 N/mm2

Material 42CrMo4 Heat Treatment

• Quenching temperature: 820 to 880 ℃ (Austenitizing period: at least 30 min; Quenching agent: Oil or water)
• Tempering temperature: 540 to 680 ℃ (at least 60 min)
• End quench test: 850 ± 5 ℃

42CrMo4 Equivalent Material

42CrMo4 material (1.7225 steel) equivalent to US ASTM AISI SAE, Germany DIN, British BSI, France NF, ISO, Japanese JIS and Chinese GB standard. (For reference)