27SiMn is a high-strength alloy structural steel containing silicon and manganese as the main alloying elements. It delivers an excellent combination of strength, toughness, and hardenability, making it widely used for forged and welded components in engineering and construction machinery. This grade performs well under impact and dynamic loads, especially after quenching and tempering treatment.
Chemical Composition (%):
C: 0.24–0.32
Si: 1.10–1.40
Mn: 1.10–1.40
P: ≤ 0.025
S: ≤ 0.025
Key Advantages
High tensile strength and impact resistance
Good weldability and heat treatment response
Stable mechanical performance in low-temperature environments
Excellent fatigue and wear resistance for demanding applications
Reliable machinability and structural integrity after forging
Main Applications
27SiMn steel is used in a variety of heavy-duty parts, including:
Engineering machinery components such as shafts, axles, and rods
Automotive parts requiring both strength and elasticity
Pressure vessel and pipeline fittings
Crane arms, booms, and mechanical supports
Oil and gas tools and structural parts subjected to shock loads
Equivalent Grades:
DIN: 30MnSi
ASTM/SAE: 1330 (approx.)
JIS: SCR420
Quality Supply from ChinaSpecSteel
ChinaSpecSteel offers 27SiMn alloy steel sourced from Jiyuan Iron & Steel Group, one of China’s most established producers of special steel. Supported by advanced smelting, refining, and rolling facilities, the steel exhibits stable chemical composition and uniform mechanical performance.
Supply Capabilities:
Hot rolled and forged 27SiMn bars, billets, and blanks
Custom sizes and heat treatment options (quenching, tempering, normalizing)
Mill certificates and optional SGS/BV inspection
OEM machining and export-standard packaging
Competitive factory-direct pricing and reliable global delivery
Production Strength of Jiyuan Iron & Steel
Jiyuan Iron & Steel Group operates a long-process integrated steel production system, including ironmaking, steelmaking, and rolling. The facility is equipped with advanced inspection and testing technology, maintaining an internationally advanced standard of quality control.
The company is recognized as one of China’s key production bases for special steel bars and wire rods. Its product range 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.
Further processed materials include precision wire, heat-treated bars, bright bars, and fasteners, used widely in automotive, machinery, energy, and heavy engineering sectors.
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