40Cr Alloy Steel Sheet – High-Strength Quenched & Tempered Structural Steel Plate

40Cr Alloy Steel Sheet – High-Strength Quenched & Tempered Structural Steel Plate - Image 2

40Cr Alloy Steel Sheet – High-Strength Quenched & Tempered Structural Steel Plate - Image 3

40Cr Alloy Steel Sheet – High-Strength Quenched & Tempered Structural Steel Plate - Image 4

40Cr Alloy Steel Sheet – High-Strength Quenched & Tempered Structural Steel Plate

| PRODUCT INTRODUCTION

40Cr alloy steel sheet is one of the most commonly used structural alloy steels in China and internationally. It belongs to the GB/T 3077 standard and is comparable to AISI 5140, DIN 41Cr4, or JIS SCr440. Known for its high strength, good toughness, and superior hardenability, 40Cr performs exceptionally well under quenching and tempering heat treatment.

This alloy steel sheet is ideal for components that demand high mechanical properties such as strength, toughness, and fatigue resistance. It is also suitable for induction hardening of the surface to improve wear resistance.

|PRODUCT FEATURES

High strength after quenching & tempering
Good wear resistance and fatigue strength
Suitable for further heat treatment (carburizing, induction hardening)
Excellent machinability and weldability with proper procedure
Uniform thickness and flatness control
Supplied as hot rolled or precision-cut sheets

| CHEMICAL ELEMENT CONTENT (%)

Element	Composition (%)
C	0.37~0.44
Si	0.17~0.37
Mn	0.50~0.8
S	≤0.035
P	≤0.035
Cr	0.8~1.10
Ni	≤0.3
Cu	≤0.3
Mo	≤0.15

WHAT IS ASTM 4140 EQUIVALENT TO?

China		Taiwan	Japan	South Korea	ISO	Germany		France	USA	United Kingdom
GB	ISC	CNS	JIS	KS	ISO	DIN EN/DIN	W-Nr.	NF EN/NF	ASTM/AISM	BS EN/BS
42Cr	A20402	SCr440	SCr440	SCr440	42Cr4	42Cr4	1.7035	42C4	5140	530M40

| APPLICATION

40Cr alloy steel sheets are widely used in machinery manufacturing, automotive, mold making, and heavy equipment industries. Typical applications include:

Transmission gears and gear rings
Drive shafts, connecting rods, axles
Clutch and brake components
Mold bases and tool holders
High-load mechanical parts and flanges
Agricultural and construction machinery parts

Thanks to its balance of strength and toughness, 40Cr is an ideal material for parts that operate under moderate to high loads and require resistance to shock and wear.