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1. (WO2018086394) PROCESS FOR PRODUCING LS-CRNIMO30C STEEL FORGING USING CONTINUOUS CASTING BILLET FOR SUBSEA OIL PRODUCTION WELLHEAD DEVICE

Pub. No.:    WO/2018/086394    International Application No.:    PCT/CN2017/096706
Publication Date: Fri May 18 01:59:59 CEST 2018 International Filing Date: Fri Aug 11 01:59:59 CEST 2017
IPC: C22C 33/04
C22C 38/02
C22C 38/04
C22C 38/18
C22C 38/12
B22D 11/115
Applicants: JIANG YIN XING CHENG SPECIAL STEEL WORKS CO., LTD
江阴兴澄特种钢铁有限公司
Inventors: HU, Shaoxin
胡绍鑫
XU, Xiaohong
许晓红
SHAO, Shuyan
邵淑艳
HUANG, Zhen
黄镇
NIE, Aichen
聂爱诚
JI, Ling
冀鸰
ZHU, Guorong
朱国荣
Title: PROCESS FOR PRODUCING LS-CRNIMO30C STEEL FORGING USING CONTINUOUS CASTING BILLET FOR SUBSEA OIL PRODUCTION WELLHEAD DEVICE
Abstract:
The invention provides a process for producing an LS-CrNiMo30C steel forging using a continuous casting billet, for use in a subsea oil production wellhead device. A forged round steel bar is produced employing a Φ600 mm continuous casting round billet. The process includes steps of smelting molten steel, continuous casting, forging, annealing, cooling, and the like. A temperature ramp rate when heating the casting billet during forging is ≤ 200ºC/h, a forging heating temperature is 1200-1250ºC, a primary forging temperature is higher than 1150ºC, and the final forging temperature is not less than 850ºC. After being removed from the production line, the forgings are slowly cooled in a sand pit under a high temperature of ≥ 500ºC. After the temperature decreases to below 200ºC, the forgings are removed from the sand pit and slowly cooled.