Our drill steel blooms produced with continuous casting and rolling process flow per the United States API SPEC7 standard, with grades of AISI4145H (for drill collars) and SAE4137 (for drill pipe joints) being widely used in major oilfields across China and exported to North America. They have been highly appraised for their high purity and balanced composition and performance.
（1）Delivery state: hot-rolled, normalized, annealed, quenched and tempered.
（2） Listed specifications are only typical grades; products of required specifications can be developed/produced per international, Chinese or industry standards, or based on agreements with customers.
Implementation of standards
User Agreement or by mutual agreement
Hubei Kaixin Supply Chain Management Co., Ltd.
TEL ：+8618272169977 ; 0714-6510168
Add：No.37 Huahu Ave Huahu Street.Huangshi City Hubei