X30CrMoA is a chromium-molybdenum alloy steel known for its excellent strength, toughness, and heat resistance. It delivers stable performance under high mechanical stress and elevated temperatures, making it suitable for critical industrial components. With its balanced alloy composition, X30CrMoA exhibits superior hardenability, wear resistance, and fatigue strength after proper heat treatment.
This steel grade is often used for gears, shafts, connecting rods, and pressure components, where dimensional stability and reliability are essential. Its performance characteristics are comparable to internationally recognized Cr-Mo alloy steels used in the automotive, machinery, and energy sectors.
Chemical Composition (% by weight)
C: 0.28–0.34
Si: 0.17–0.37
Mn: 0.40–0.70
Cr: 0.80–1.10
Mo: 0.15–0.25
P: ≤ 0.025
S: ≤ 0.025
Material Features and Benefits
High tensile and yield strength, even after long-term service
Excellent tempering resistance and thermal stability
Good toughness and impact resistance in quenched and tempered condition
Reliable hardenability suitable for medium and large cross-sections
Stable machinability before hardening, ideal for precision forging and machining
Main Industrial Applications
X30CrMoA alloy steel is commonly used in heavy-duty mechanical and automotive engineering, as well as in energy and pressure systems. Typical applications include:
Transmission shafts and gear components
Crankshafts, connecting rods, and spindles
Bolts, nuts, and fasteners requiring high fatigue resistance
Pressure vessel parts and pipeline fittings exposed to temperature variations
Forged mechanical components in construction and mining machinery
Equivalent Standards:
DIN: 30CrMo4
ASTM/SAE: 4130 (approx.)
JIS: SCM430
Quality Supply from ChinaSpecSteel
ChinaSpecSteel supplies X30CrMoA alloy steel produced by Jiyuan Iron & Steel Group, one of China’s most advanced special steel manufacturers.
Relying on a long-process integrated production route, from ironmaking and steelmaking to rolling and finishing, Jiyuan ensures stable composition, clean internal structure, and precise mechanical control for every batch.
Available Supply Options:
Hot rolled or forged bars, billets, and rods
Heat-treated (Q+T) or normalized steel per order requirements
Custom dimensions and tolerances for OEM projects
Mill test certificates (EN 10204/3.1) and optional third-party inspection
Reliable export packaging and on-time global shipment
Production and Technical Strength — Jiyuan Iron & Steel
Jiyuan Iron & Steel Group operates a fully integrated long-process production line, featuring advanced smelting, refining, and inspection technologies.
The company maintains international-grade process control and strict quality management, ensuring consistent metallurgical performance across its range of special steels.
Jiyuan’s product portfolio covers bearing steel, spring steel, cord steel, cold heading steel, gear steel, free-cutting steel, non-quenched and tempered steel, alloy structural steel, carbon structural steel, high-strength wear-resistant steel, tube billet steel, anchor chain steel, and continuous cast iron profiles.
In addition, precision wire, heat-treated bars, bright bars, and fasteners are produced to meet the needs of automotive, machinery, energy, and heavy equipment industries worldwide.
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