NO.1 Supplier of Alloy 4140 Plate in China

AISI 4140 Alloy Steel is a common chromium-molybdenum steel that usually used after quenched and tempered, with high intensity, high hardenability. The alloy 4140 plate also has high fatigue strength and good low-temperature impact toughness.

Otai has great advantage on 4140 steel plate:

  • 10000+ tons daily stock of 4140 alloy plate or flat bar.
  • Hot rolled / annealed / Q+T (PH prehardened) condition available. 
  • Thickness 4-300mm available for 1-3 days shipment.
  • Thickness 1-10mm cold rolled sheet for 30 days lead time.
  • Cut to width & cut to length service available.
  • Machined to tolerance & roughness pieces service available.

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Our Customers

BOHLER BUYS TOOL STEEL AND ALLOY STEEL FROM OTAI STEEL
Uddeholm BUYS FROM OTAI SPECIAL STEEL
thyssenkrupp BUYS FROM OTAI SPECIAL STEEL
otai supplies schlumberger 8620 steel round bar
fastenal buys alloy steel and carbon steel from otai

Chemical Composition

AISI 4140 C Mn Si P S Cr Mo
0.38-0.43 0.75-1.00 0.15-0.35 0.035 max 0.040 0.80-1.10 0.15-0.25

Relevant Specifications and Equivalents

ASTM A29 Material No. DIN BS EN 10083 JIS G4105 BS 970-3-1991 BS 970-1955 AS 1444 AFNOR
4140 1.7225 38HM 42CrMo4 SCM440 708M40 EN19A 4140 42CD4

Certificate & SGS Report

iso-9001---&-sgs--certify-otai

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