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

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 […]

Read more
M2 VS M42 steel

What’s the difference with M2 and M42 high speed steel?

High-speed steel is a high-alloy steel containing large amounts of carbon (C), tungsten (W), molybdenum (Mo), chromium (Cr), vanadium (V) and other elements. It has high  hardness after heat treatment. […]

Read more
Powder Metallurgy High Speed Steel

What is Powder metallurgy high-speed steel (PMHSS) ?- TPM330, ASP23，M3:2

Before understanding powder high-speed steel, we first understand what powder metallurgy is. Powder metallurgy refers to a steel manufacturing process in which fine steel powder is obtained by atomizing molten […]

Read more