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Production method of 540 MPa grade hot-rolled pickled plate with low cost and high hole expansion rate

A hot-rolled pickling and production method technology, which is applied in the field of hot-rolled pickling plates, can solve the problems of high-grade manganese sulfide inclusions, poor formability, poor welding performance, etc., to ensure the structure and mechanical properties, reduce manufacturing costs, The effect of excellent hole expansion performance

Active Publication Date: 2018-02-06
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a production method of 540MPa grade hot-rolled pickled plate with low cost and high hole expansion, to solve the problem that the 540MPa grade hot-rolled pickled plate produced by the prior art is prone to surface warping, serious internal band structure, Quality problems such as high grade manganese sulfide inclusions, and problems such as low yield, poor formability, and poor welding performance in the application of hot-rolled pickled sheets

Method used

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  • Production method of 540 MPa grade hot-rolled pickled plate with low cost and high hole expansion rate
  • Production method of 540 MPa grade hot-rolled pickled plate with low cost and high hole expansion rate

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Embodiment 1

[0030] In this embodiment, through the design of reasonable chemical composition, rolling process, pickling and smoothing process, the good performance and surface quality of the product are guaranteed. The specific process is as follows:

[0031] ①Process flow: molten iron pretreatment→converter smelting→outside refining→continuous casting→heating→controlled rolling and controlled cooling→coiling→pickling→levelling→functional inspection→packing for delivery;

[0032] ② Refer to Table 1 for chemical composition;

[0033] Table 1 Chemical composition of 540MPa grade hot-rolled pickling plate for high hole expansion (wt%, the balance is Fe)

[0034] Element

C

Si

mn

P

S

Alt (full aluminum)

N

standard

---

---

---

≤0.025

≤0.025

≥0.01

--

Example 1

0.030

0.52

1.75

0.018

0.012

0.04

0.0040

[0035] ③Hot rolling start temperature: 1250°C, hot rolling finish temperature: 880°C, coiling temperat...

Embodiment 2

[0041] In this embodiment, through the design of reasonable chemical composition, rolling process, pickling and smoothing process, the good performance and surface quality of the product are guaranteed. The specific process is as follows:

[0042] ①Process flow: molten iron pretreatment→converter smelting→outside refining→continuous casting→heating→controlled rolling and controlled cooling→coiling→pickling→levelling→functional inspection→packing for delivery;

[0043] ② Refer to Table 2 for chemical composition;

[0044] Table 2 Chemical composition of 540MPa grade hot-rolled pickling plate for high hole expansion (wt%, the balance is Fe)

[0045] Element

C

Si

mn

P

S

Alt (full aluminum)

N

standard

---

---

---

≤0.025

≤0.025

≥0.01

--

Example 2

0.040

0.55

1.80

0.015

0.010

0.05

0.0030

[0046] ③Hot rolling start temperature: 1200°C, hot rolling finish temperature: 870°C, coiling temperat...

Embodiment 3

[0052] In this embodiment, through the design of reasonable chemical composition, rolling process, pickling and smoothing process, the good performance and surface quality of the product are guaranteed. The specific process is as follows:

[0053] ①Process flow: molten iron pretreatment→converter smelting→outside refining→continuous casting→heating→controlled rolling and controlled cooling→coiling→pickling→levelling→functional inspection→packing for delivery;

[0054] ②Chemical composition refers to Table 3;

[0055] Table 3 Chemical composition of 540MPa grade hot-rolled pickling plate for high hole expansion (wt%, the balance is Fe)

[0056] Element

C

Si

mn

P

S

Alt (full aluminum)

N

standard

---

---

---

≤0.025

≤0.025

≥0.01

--

Example 3

0.060

0.56

1.87

0.016

0.011

0.03

0.0038

[0057] ③Hot rolling start temperature: 1270°C, hot rolling finish temperature: 860°C, coiling temperature:...

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Abstract

The invention relates to the field of hot-rolled pickled plates, in particular to a production method of a 540 MPa grade hot-rolled pickled plate with a low cost and a high hole expansion rate. According to the production method, through reasonable design of chemical components, a rolling process and a pickling and leveling process, the good performance and surface quality of the product are guaranteed. By adopting the production method provided by the invention, the quality problems that a 540 MPa grade hot-rolled pickled plate produced in the prior art is prone to surface peeling, internal banded structures are severe, and manganese sulfide occluded foreign substances are high in grade can be solved, and the problems that during application of the hot-rolled pickled plate, the yield is low, the moldability is poor, and the welding performance is poor can be solved.

Description

technical field [0001] The invention relates to the field of hot-rolled pickled plates, in particular to a production method of 540MPa-grade hot-rolled pickled plates for low-cost and high-hole expansion. Background technique [0002] Hot-rolled pickled sheet is made of high-quality hot-rolled sheet as raw material. After the pickling unit removes the oxide layer, trims the edge, and finishes, the surface quality and use requirements (mainly cold-formed or stamping performance) are between hot-rolled sheet and Intermediate product between cold rolled sheets. [0003] The following key technical problems exist in the production of 540MPa grade hot-rolled pickling plates for high hole expansion: [0004] (1) Reasonable composition design and hot rolling process can produce hot-rolled pickling products with excellent hole expansion performance, good plate shape and surface quality. [0005] (2) Reasonable pickling process and smoothing process ensure that the surface quality ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D8/02
CPCC21D8/0226C21D2211/002C21D2211/005C22C38/001C22C38/02C22C38/04C22C38/06
Inventor 康海军杨得草王旭生于立伟
Owner BENGANG STEEL PLATES
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