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

How Does 1.2083 Steel Compare to Other Steels?

How Does 1.2083 Steel Compare to Other Steels?

What is 1.2083 Steel? 1.2083 steel is a high-grade stainless steel known for its exceptional wear resistance and corrosion resistance. It’s primarily used in applications where a high degree of […]

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SAE AISI 4140-round-bar

How to avoid sand holes in steel

Porosity (sand holes) inside steel can result from various factors during the manufacturing and processing stages. How to avoid the sand holes in the steel and how to ensure our […]

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How to avoid crack in steel

How to avoid crack in steel

Today, we did a pre-delivery inspection and found that one piece 1. 2379 round bar had crack on the surface. Why is this?And how to avoid crack?   Material Quality: […]

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