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

Why 1.2083 Stainless Mold Steel Causes Pit Holes After Machining | Cleanliness & Steelmaking Process Explained

Why 1.2083 Stainless Mold Steel Causes Pit Holes After Machining | Cleanliness & Steelmaking Process Explained

If you are working with 1.2083 stainless mold steel (X42Cr13 / AISI 420 modified), you may have experienced a frustrating issue: After CNC machining, grinding, or mirror polishing, small defects […]

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S355JR vs S355J2: Same Steel, But Not the Same Performance

What is S355 Structural Steel? S355 is a non-alloy structural steel grade widely used in Europe and global engineering markets. The naming is simple: S = Structural steel 355 = […]

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Why Does 34CrNiMo6 (1.6582) Round Bar Distort During Machining? Straightness and Residual Stress Explained

Many machine shops have experienced the same frustrating problem. A 34CrNiMo6 (1.6582) round bar looks perfectly straight when it arrives. The straightness is within specification. However, after rough turning or […]

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