TOP TOOL STEEL & SPECIAL STEEL SUPPLIER IN CHINA

SUPPLY TOP QUALITY TOOL STEEL WORLDWIDE

Why Us

Over 20 Years Experience

Otai is over 20 years experienced for 4140 plate, 4140 round, 8620 round, 4340 round bar. We know customers concern and avoid the problems on delivery.

ISO 9001 Certified & SGS

We are ISO9001:2015 certified and our supplied products also pass SGS inspection. Quality is key to win long term cooperation customers.

10000+ Tons 4140 Plate

As No. 1 Stockist of AISI 4140 steel plate, we keep daily stock of over 10000 tons from 4mm to 300mm thickness. Machined pieces are also available.

Professional Staff

Our skilled and professional staff will solve your problems and worries pre sales or after sales. You are comfortable during our cooperation.

Featured Customers

BOHLER-
fastenal, otai supplies 1045 and 4140 steel round bar.
thyssenkrupp , otai supplies carbon steel and alloy steel
schlumberger- otai supplies 8620 steel round bar
UDDEHOLM-

Latest News & Blog

30CrMo steel-otai

4130/30CrMo/25CrMo4/1.7218/SCM430 Steel

4130 steel is widely used in aerospace field , oilfield, and tooling shops. Think of 4130  as the reliable pickup truck of the alloy steel world. It isn’t flashy. But when […]

Read more
gear 2

16MnCr5 Steel: The Gearbox Hero You’ve Been Looking For

16MnCr5 steel is an alloy steel which has good hardenability and machinability. For larger cross-section parts, it can achieve high surface hardness and wear resistance after heat treatment, and also […]

Read more
S1 STEEL ROUND BAR-OTAI

S1 Steel: A Good Choice in Punching and Shearing Operations

Ever feel like your tools are just one impact away from a catastrophic crack? You are not alone. In the world of stamping and shearing, brittle tools are a nightmare. […]

Read more