35CrMnSiA is a chromium–manganese–silicon alloy structural steel with excellent strength, toughness, and wear resistance after heat treatment.
This grade combines moderate hardenability with strong impact performance, making it a preferred material for forged and machined parts exposed to high mechanical loads.
Commonly used in automotive, mining, construction, and defense industries, 35CrMnSiA offers a stable balance of durability, elasticity, and fatigue strength, performing reliably under both static and dynamic stresses.
Chemical Composition (% by weight)
C: 0.32–0.40
Si: 0.90–1.20
Mn: 0.70–1.00
Cr: 0.80–1.10
P: ≤ 0.030
S: ≤ 0.030
Microalloying and controlled deoxidation processes further enhance its grain refinement and hardenability, giving it uniform metallurgical properties.
Material Characteristics
High tensile and yield strength after quenching and tempering
Reliable fatigue and impact resistance, suitable for cyclic stress conditions
Good machinability in the annealed state and dimensional stability after heat treatment
Excellent hardenability and tempering stability for complex forged parts
Compatible with surface hardening (induction or nitriding) for improved wear resistance
Typical Industrial Applications
35CrMnSiA alloy steel is used in parts requiring high strength, wear resistance, and fatigue life. Common applications include:
Transmission shafts, axles, and drive gears
Connecting rods, spindles, and crankshafts
Bolts, studs, and fasteners under dynamic load
Machine tool components and mining equipment parts
Aircraft and vehicle structural elements requiring lightweight strength
Equivalent Standards:
DIN: 38CrMnSi5
ASTM/SAE: 4135 (approx.)
JIS: SCR440
Reliable Supply from ChinaSpecSteel
ChinaSpecSteel supplies 35CrMnSiA alloy steel produced by Jiyuan Iron & Steel Group, a leading Chinese manufacturer of special and high-quality steels.
Jiyuan operates a long-process integrated production line combining ironmaking, steelmaking, rolling, and heat treatment, ensuring stable chemical composition, fine microstructure, and consistent mechanical properties.
Available Supply Forms:
Hot-rolled and forged bars, billets, and blocks
Heat-treated (Q+T), normalized, or annealed options
Custom sizes and machining-ready blanks for OEM production
Mill test certificates (EN 10204/3.1) and third-party inspection upon request
Export-standard packaging for sea and land transport
Processing Capabilities:
Precision cutting and surface finishing
Heat treatment and hardness testing
Surface protection (anti-rust oil or coating)
Manufacturing Strength — Jiyuan Iron & Steel
Jiyuan Iron & Steel Group is one of China’s largest production bases for special bar and wire rod steels, equipped with modern smelting, refining, and quality inspection facilities.
Its advanced production technology and strict quality control system ensure uniform microstructure, stable composition, and excellent toughness performance.
The company’s product portfolio covers bearing steel, spring steel, cord steel, cold heading steel, gear steel, free-cutting steel, alloy structural steel, carbon structural steel, high-strength wear-resistant steel, tube billet steel, anchor chain steel, and continuous cast iron profiles.
It also provides precision wire, heat-treated bars, bright bars, and fasteners for industries such as automotive manufacturing, construction machinery, shipbuilding, and energy equipment.
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