PRODUCTION OF HOT ROLLED STEEL STRIP FOR STEEL PIPE EXCELLENT IN HIC RESISTANCE

Title:

PRODUCTION OF HOT ROLLED STEEL STRIP FOR STEEL PIPE EXCELLENT IN HIC RESISTANCE

Document Type and Number:

Japanese Patent JPH0681034

Kind Code:

A

Abstract:

PURPOSE: To produce a hot rolled steel plate used for the production of line pipe of API-X52 to 70 grade excellent in HIC resistance at a low cost.

CONSTITUTION: A continuously cast slab having a composition which consists of, by weight ratio, ≤0.08% C, 0.15-0.35% Si, 0.80-1.40% Mn, ≤0.015% P, ≤0.0020% S, 0.010-0.040% Ti, 0.010-0.050% Nb, 0.0015-0.0035% Ca, and the balance Fe with inevitable impurities and where Ca/S is regulated to ≥2.0 is directly charged into a heating furnace for hot rolling. The cast slab is heated and held at ≥1250°C for ≥10hr in the heating furnace for hot rolling and then subjected, without cooling, to hot rolling at ≥850°C finishing temp. The resulting hot rolled steel strip is cooled rapidly on a hot line table at (5 to 25)°C/sec average rate and coiled at 400-550°C. This hot rolled steel strip can further contain prescribed amounts of V, Mo, Cu, and Ni.

More Like This:

JP6514777	Steel materials for high-strength pressure vessels with excellent low-temperature toughness after PWHT and their manufacturing methods
JP3567726	Structural steel with excellent seismic resistance and its manufacturing method
JPS63105929	MANUFACTURE OF STEEL SHEET FOR SPIRAL FIN

Inventors:

GOSHO NOBUYUKI
ONO TOMIAKI
KOGAI YOSHIYUKI

Application Number:

JP25725192A

Publication Date:

March 22, 1994

Filing Date:

August 31, 1992

Export Citation:

Click for automatic bibliography generation Help

Assignee:

SUMITOMO METAL IND

International Classes:

C21D8/02; C21D9/46; C22C38/00; C22C38/14; (IPC1-7): C21D8/02; C21D9/46; C22C38/00; C22C38/14

Domestic Patent References:

JPH02263918A	1990-10-26
JPS5763631A	1982-04-17
JPS59104428A	1984-06-16

Attorney, Agent or Firm:

Raw form Motoshige (1 person outside)

Next Patent: PRODUCTION OF LEAD FRAME MATERIAL