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

1.2343 esr BLOCK

DIN 1.2343 ESR( X37CrMoV5-1) Hot Work Steel

At Dongguan Otai Special Steel, we recognize that selecting the right material for your tooling is about finding the perfect balance—between toughness and wear resistance, between strength and machinability. Today, […]

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1.2344 vs 1.2343 steel -Otai

1.2344 vs 1.2343 Steel: Comparison of Hot Work Tool Steels

Choosing the right steel for your tooling application isn’t just a technical decision; it’s a business decision that impacts your production efficiency, tool life, and bottom line. When it comes […]

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O1 Tool Steel | 1.2510 | 100MnCrW4 | SKS3

O1 Tool Steel | 1.2510 | 100MnCrW4 | SKS3

What Exactly Is O1  Steel? Let’s start with a simple truth: O1 steel is not a mystery. It is a low-alloy, cold-work tool steel that must be oil-quenched during heat treatment. That […]

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