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Production method of high-straightness tubular pile plate DH36

A DH36, production method technology, applied in metal rolling, manufacturing tools, metal processing equipment, etc., can solve problems such as increased production costs, reduce production costs, improve overall customer satisfaction, and improve the pass rate.

Inactive Publication Date: 2021-07-09
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the incidence rate of poor plate shape is about 35%, and the local unevenness is 12-15mm / 2m, which exceeds the standard requirements and needs to be rescued by pressing, resulting in an increase in production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This example provides a production method of high straightness pipe pile sheet DH36, the chemical composition and mass percentage of the steel sheet are as follows: C: 0.146%, Mn: 1.412%, Si: 0.186%, Cr: 0.124%, Nb: 0.038 %, no Ca is added, and the balance is Fe and unavoidable impurities.

[0030] Using 260*2770mm billet to produce 65*3110mm pipe pile DH3, the production method includes the following steps:

[0031] S1. The blank is heated by a walking heating furnace, the heating time is 0.83 min / mm, the actual tapping temperature is 1145°C, and the uniformity of the slab tapping temperature is 6°C;

[0032] S2. After the slab is released from the furnace, the descaling box is descaled for 1 step, and the iron oxide scale on the surface of the steel plate is removed;

[0033] S3. The rolling mill adopts three-slab rolling, and the rolling adopts even-pass rolling, and the rolling pass is "7+5+1". Roll gap +2.5mm, variable roll gap chamber roll gap drop 0.3mm;

[00...

Embodiment 2

[0041] A production method of high straightness pipe pile sheet DH36 provided in this example, the chemical composition and mass percentage of the steel sheet are as follows: C: 0.142%, Mn: 1.435%, Si: 0.179%, Cr: 0.128%, Nb: 0.032 %, no Ca is added, and the balance is Fe and unavoidable impurities.

[0042] Using 320*2570mm billet to produce 70*3110mm pipe pile DH3, the production method includes the following steps:

[0043] S1. The blank is heated by a walking heating furnace, the heating time is 1.01 min / mm, the actual tapping temperature is 1158°C, and the uniformity of the slab tapping temperature is 2°C;

[0044] S2. After the slab is released from the furnace, the descaling box is descaled for 1 step, and the iron oxide scale on the surface of the steel plate is removed;

[0045] S3. The rolling mill adopts three-slab rolling, and the rolling adopts even-pass rolling, and the rolling pass is "7+5+1". Roll gap +2.5mm, variable roll gap chamber roll gap drop 0.3mm;

...

Embodiment 3

[0053] This example provides a production method of high straightness pipe pile sheet DH36, the chemical composition and mass percentage of the steel sheet are as follows: C: 0.149%, Mn: 1.442%, Si: 0.185%, Cr: 0.139%, Nb: 0.038 %, no Ca is added, and the balance is Fe and unavoidable impurities.

[0054] Using 260*2070mm billet to produce 50*2110mm pipe pile DH3, the production method includes the following steps:

[0055] S1. The blank is heated by a walking heating furnace, the heating time is 0.85min / mm, the actual tapping temperature is 1148°C, and the uniformity of the slab tapping temperature is 7°C;

[0056] S2. After the slab is released from the furnace, the descaling box is descaled for 1 step, and the iron oxide scale on the surface of the steel plate is removed;

[0057] S3. The rolling mill adopts three billet rolling, the rolling adopts even pass rolling, the rolling pass is "5+5+1", the last pass adopts the variable roll gap leveling function, and the initial ...

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Abstract

The invention discloses a production method of a high-straightness tubular pile plate DH36, and relates to the technical field of steel production. A steel plate comprises the following chemical components in percentage by mass: 0.10 percent to 0.20 percent of C, 1.0 percent to 2.0 percent of Mn, 0.10 percent to 0.30 percent of Si, 0.05 percent to 0.20 percent of Cr, 0.03 percent to 0.05 percent of Nb, no Ca, and the balance of Fe and inevitable impurities. The final rolling pass adopts the flattening pass, the flattening head and the flattening tail adopt a variable roll gap mode, and the roll gap is continuously reduced by 0.3 mm on the basis of plan setting, so that the defect plate types such as warping or buckling of the head and the tail of the steel plate are improved, the unevenness of the flattened steel plate is smaller than or equal to 6 mm / 2 m, the first-pass yield of the plate type of the pipe pile steel plate is increased, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a production method of high straightness pipe pile sheet DH36. Background technique [0002] During the rolling process of the tube-loaded plate, due to the influence of the temperature difference between the upper and lower surfaces, the speed drop of the upper and lower rolls, the reduction rate, the descaling water and other factors, the steel plate has different metal extensions and poor shape of the head and tail plates when the steel plate bites. (warping or knocking). At present, the incidence rate of poor plate shape is about 35%, and the local unevenness is 12-15mm / 2m, which exceeds the standard requirements and needs to be saved by flattening, resulting in an increase in production costs. [0003] In order to reduce the production cost and improve the customer's satisfaction with the shape of the pipe pile sheet, under the premise of ensuring the prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22B21B15/00C22C38/02C22C38/04C22C38/26C22C38/38
CPCB21B1/22B21B15/00C22C38/02C22C38/04C22C38/26C22C38/38B21B2001/225
Inventor 邓飞翔翟冬雨吴俊平吴伟勤牛继龙孙旭东陈维宇王凡成康荣吴结文张淼
Owner NANJING IRON & STEEL CO LTD
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