Unlock instant, AI-driven research and patent intelligence for your innovation.

A Rolling Method for Improving the Pass Rate of Steel Plate Flaw Detection

A pass rate, steel plate technology, applied in the direction of metal rolling, metal rolling, rolling mill control devices, etc., can solve the problems of insufficient space, stack cooling time affects production operation, stack cooling temperature is difficult to be guaranteed, etc.

Active Publication Date: 2018-02-09
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But for 25~40mm steel plates, it is difficult to ensure the cooling temperature of the stack, and the long cooling time will also affect the production operation, and if all the steel plates are stacked and cooled, there is not enough space

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Rolling Method for Improving the Pass Rate of Steel Plate Flaw Detection
  • A Rolling Method for Improving the Pass Rate of Steel Plate Flaw Detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: 220mm thick continuous casting slab rolling 35mm thick plate

[0013] The continuous casting slab with a thickness of 220mm is sent to the heating furnace for heating, the heating rate is 10min / cm, the furnace temperature is 1206°C, and the casting slab soaking time is 30min.

[0014] (1) The rolling of the steel plate adopts controlled rolling and controlled cooling. The rough rolling start temperature is 1087°C, the rough rolling finish temperature is 1013°C, and the reduction rates of the last three passes after widening are 19%, 18%, and 16%, respectively. The thickness of the billet is 120mm; the starting temperature of the finish rolling varies between 896°C, and the finish rolling temperature is the Mulpic water entry temperature of 819°C;

[0015] (2) The Mulpic accelerated cooling control adopts the first stage of strong cooling with a cooling rate of 18°C / S, so that the surface temperature of the steel plate reaches 615°C at the end of the first ...

Embodiment 2

[0018] Embodiment 2: 180mm thick continuous casting slab rolling 30mm thick plate

[0019] The continuous casting slab with a thickness of 180mm is sent to the heating furnace for heating. The heating process is as follows: the heating rate is 8min / cm, the furnace temperature is 1216°C, and the casting slab soaking time is 30min.

[0020] (1) The rolling of the steel plate adopts controlled rolling and controlled cooling. The rough rolling start temperature is 1069°C, the rough rolling finish temperature is 1006°C, and the reduction rates of the last three passes after widening are 18%, 16%, and 17%, respectively. The thickness of the billet is 100mm; the starting temperature of the finish rolling varies between 885°C, and the final rolling temperature is the Mulpic water entry temperature of 806°C;

[0021] (2) The Mulpic accelerated cooling control adopts the first stage of strong cooling with a cooling rate of 16°C / S, so that the surface temperature of the steel plate reach...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a rolling method for increasing the flaw detection qualification rate of steel plates. Through control over the rolling temperature, the water temperature and a proper Mulpic process, the re-reddening temperature of the steel plates of 25-40 mm is controlled at 600-680 DEG C; ferrite perlitic transformation of austenites in the cores of the steel plates is realized before Mulpic, and the situation that the cores of the steel plate crack due to occurrence of brittle microstructures such as bainites and martensites under the conditions that stack cooling cannot be conducted or stack cooling conditions are insufficient is avoided, so that the flaw detection qualification rate is increased.

Description

technical field [0001] The invention belongs to the steel rolling cooling process technology, in particular to the control of the cooling process of the Mulpic accelerated cooling system. Background technique [0002] Due to the existence of segregation in the center of the slab, after the steel plate with a specification of 25-40 mm is rolled and cooled, a large amount of brittle structures such as bainite and martensite often appear in the center of the steel plate, and under the action of internal stress, it is easy to form a core. There are cracks in the part, so that the steel plate is unqualified in the flaw detection inspection. At present, the usual practice of iron and steel enterprises is to cool the steel plate, so that the internal stress of the steel plate can be effectively released, and the generation of cracks in the core can be prevented. However, for steel plates with a size of 25-40mm, it is difficult to ensure the cooling temperature of the stack. If the...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/74B21B37/16
CPCB21B37/16B21B37/74
Inventor 杨俊汤伟钱亚军周光杰
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD