LEADING TOOL STEEL & ALLOY STEEL SUPPLIER

SUPPLY TOP QUALITY TOOL STEEL WORLDWIDE

Why Us

Over 20 Years Experience

Otai has over 20 years of professional experience for 4140 / 42CrMo4 plate, 4140 round, 1.2738 steel plate, and 34CrNiMo6 round bar etc. We know customers’ concerns and avoid problems with delivery.

ISO 9001 Certified & SGS

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

10000+ Tons 4140 Plate

As the No. 1 Stockist of AISI 4140 / 42CrMo4 steel plate, we keep daily stock of over 10000 tons from 4mm to 300mm thickness. Machined and finished ground 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

UDDEHOLM- buys from otai continuously
fastenal-buys from Otai for fasten products
thyssenkrupp is also our key important customer on plastic mold steel material
schlumberger-buys 8620 steel round bar from Otai with required technical specification
BOHLER is OTAI's VIP customer in alloy steel and tool steel

Latest News & Blog

1.2343 Steel: Properties, Applications, and Complete Guide

1.2343 Steel: Properties, Applications, and Complete Guide

When it comes to hot work tool steels, 1.2343 steel is one of the most widely used and trusted materials across industries such as automotive, die casting, forging, and plastic […]

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4140 vs 4340 Steel | Properties, Differences & Applications

4140 vs 4340 Steel | Properties, Differences & Applications

When it comes to alloy steels, two of the most commonly discussed grades are 4140 steel and 4340 steel. Both belong to the chromium-molybdenum family, but they each have unique […]

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No Corrosion Needed? Choose Smarter! 1.2510 I O1Tool steel

No Corrosion Needed? Choose Smarter! 1.2510 I O1Tool steel

If you want a cold-work tool steel that just works—machines cleanly, hardens reliably in oil, and delivers durable edges without breaking the bank—O1 tool steel is the go-to classic. Knife […]

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