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

DIN--1.2767-steel--MILLED-PLATE

DIN 1.2767 /45NiCrMo16/X45NiCrMo4 /SKT 5 Steel

Have you ever tried to bend a steel bar that simply refuses to move? That is the kind of resistance we are talking about with DIN 1.2767. In the world […]

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AISI A2 / 1.2363 / X100CrMoV5/ SKD12 Air-Hardening Tool Steel

AISI A2 / 1.2363 / X100CrMoV5/ SKD12 Air-Hardening Tool Steel

When you choose a tool steel for precision work, are you tired of materials that warp during heat treatment? Do you need a balance between wear resistance and toughness—without breaking […]

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4140 vs 4130 steel bar stock

4140 vs 4130 Steel ： Which one suitable for you?

If you’re comparing 4140 and 4130 steel, you’re probably holding a drawing in one hand and a calculator in the other. You need the right material—not just the one that […]

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