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

A8 Modified/1.2360 vs. D2 Steel – Which One Saves Your Tooling?

Choosing the wrong tool steel leads to early failure. Two grades we often compare are  A8 Modified/1.2360  and  D2. Both are air-hardening, but they solve different problems. A8 modified chipper […]

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4140 plate

4140 steel: an excellent choice for aviation and automation

4140 steel – an all-rounder with excellent performance 4140 steel and it’s equivalent steel  chemical  composition : Grade C Si Mn S P  Cr Mo  Ni  V W 4140 0.38-0.43 […]

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Carbon elements

Effect of Carbon on Steel Properties

Carbon element plays a key role in balancing strength and toughness in steel. Reasonable control of carbon content is a core link in steel design and production. The higher the […]

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