20CrMoA Steel Overview
20CrMoA is a premium-grade alloy structural steel known for its high strength, toughness, and excellent hardenability. It is widely used in the manufacturing of heavy-duty mechanical components that require high load-bearing capacity and resistance to wear and fatigue. As one of the most popular grades in China’s alloy steel category, 20CrMoA offers a perfect balance of strength, ductility, and machinability after heat treatment.
Chemical Composition (Typical %):
Carbon (C): 0.17–0.24
Chromium (Cr): 0.90–1.20
Molybdenum (Mo): 0.15–0.25
Manganese (Mn): 0.40–0.70
Silicon (Si): 0.17–0.37
Phosphorus (P): ≤ 0.025
Sulfur (S): ≤ 0.025
Key Features:
Excellent hardenability and strength after quenching and tempering
Good toughness and impact resistance
Stable heat treatment performance
High fatigue strength under dynamic loading
Suitable for welded and carburized structures
Typical Applications:
20CrMoA steel is commonly used in:
Automotive and motorcycle gears, shafts, and connecting rods
Heavy machinery transmission components
High-pressure bolts and fasteners
Oil and gas drill collars and tool joints
Aerospace and industrial forged parts
Equivalent Grades:
ASTM/SAE: 4130 (approx.)
DIN: 20CrMo4
JIS: SCM420
Why Choose ChinaSpecSteel？
As a professional 20CrMoA alloy steel supplier and exporter, ChinaSpecSteel relies on the strong production capability of Jiyuan Iron & Steel Group, one of China’s most advanced special steel manufacturers.
We supply:
Hot rolled, forged, and heat-treated 20CrMoA bars
Customized sizes and technical support for B2B orders
Mill test certificates and third-party inspection (SGS, BV)
Competitive export prices and reliable delivery
Global export service with full documentation support
Jiyuan Iron & Steel adopts a long-process production system, integrating ironmaking, steelmaking, and rolling, supported by advanced testing and inspection equipment. The plant features internationally advanced technology and is one of China’s largest production bases for special steel bars and wire rods.
Main product categories include bearing steel, spring steel, cord steel, cold heading steel, gear steel, free-cutting steel, non-quenched & tempered steel, alloy structural steel, carbon structural steel, high-strength wear-resistant steel, tube billet steel, anchor chain steel, and horizontally continuous cast iron profiles.
Deep-processed products include precision wire, heat-treated bars, bright bars, and fasteners — serving customers in automotive, machinery, energy, and industrial equipment sectors worldwide.
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