Title:
PLATE FOR THICK-WALL LARGE-DIAMETER GRADE X80M HOT BENDING PIPE AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/087999
Kind Code:
A1
Abstract:
The present invention relates to the technical field of steel production. Disclosed are a plate for a thick-wall large-diameter grade X80M hot bending pipe and a manufacturing method therefor. The chemical components and the mass percent of the plate are as follows: C: 0.05%-0.15%; Si: 0.10%-0.40%; Mn: 1.50%-1.80%; P≤0.015%; S≤0.0050%; Nb: 0.030%-0.080%; V≤0.060%; Ti≤0.040%; Cr≤0.40%; Ni: 0.20%-1.00%; Mo: 0.15%-0.50%; Cu≤0.35%; Al: 0.015%-0.050%; Ca: 0.0005%-0.0040%; B≤0.0005%; N≤0.0050%; and the balance being Fe and inevitable impurities. By adopting a micro-alloyed near peritectic component design and a pure steel smelting technology, a small amount of proeutectoid ferrite, acicular ferrite and granular bainite multi-phase composite tissue are obtained by means of a rolling cooling process, so that the requirements of low-temperature toughness and high strength of a product are satisfied, and the subsequent use requirements of a hot bending pipe are satisfied.
More Like This:
Inventors:
HUANG YIXIN (CN)
JIANG JINXING (CN)
QIAO MINGLIANG (CN)
ZHAI DONGYU (CN)
WU JUNPING (CN)
DU HAIJUN (CN)
LIU SHUAI (CN)
YIN JIE (CN)
JIANG JINXING (CN)
QIAO MINGLIANG (CN)
ZHAI DONGYU (CN)
WU JUNPING (CN)
DU HAIJUN (CN)
LIU SHUAI (CN)
YIN JIE (CN)
Application Number:
PCT/CN2022/125392
Publication Date:
May 25, 2023
Filing Date:
October 14, 2022
Export Citation:
Assignee:
NANJING IRON & STEEL CO LTD (CN)
International Classes:
C22C38/02; C21D8/02; C22C33/04; C22C38/04; C22C38/06; C22C38/08; C22C38/12; C22C38/16; C22C38/38; C22C38/42; C22C38/46; C22C38/48; C22C38/50; C22C38/54; C22C38/58
Foreign References:
| CN114182169A | 2022-03-15 | |||
| CN109402500A | 2019-03-01 | |||
| US20100236668A1 | 2010-09-23 |
Attorney, Agent or Firm:
NANJING LI&FENG INTELLECTUAL PROPERTY AGENCY (SPECIAL GENERAL PARTNERSHIP) (CN)
Download PDF: