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Production process for solving pitted surfaces of low-carbon steel wires

A production process and low-carbon steel technology, applied in the field of metallurgy, can solve the problems that cannot meet the customer's 0.5mm light drawing process requirements, pockmarks, and cannot be rolled and reduced, so as to increase the function of backflushing water and reduce the amount of steel passing Effect

Active Publication Date: 2020-12-15
JIANGSU YONGGANG GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, if the surface of the rough and middle rolling grooves is worn, especially the surface of the rolls in the middle rolling area, the pockmarks cannot be relieved with the subsequent rolling and rolling.
[0007] The customer complained about the quality of Yonggang Φ26mm 50BV30 products, and raised pitted defects, which could not meet the customer's 0.5mm light drawing process requirements

Method used

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  • Production process for solving pitted surfaces of low-carbon steel wires

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Experimental program
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Effect test

Embodiment 1

[0029] A production process for solving pitting on the surface of low-carbon steel wire rods, the main process parameters are:

[0030] (1) The temperature in the heating furnace is set as follows: heating section 800°C, heating section 2 990°C, soaking section 1070°C;

[0031] (2) Set the air-fuel ratio to 0.50-0.65;

[0032] (3) The high-pressure water dephosphorization setting water pressure is ≥12MPa;

[0033] (4) The temperature of each key point of the rolling line is: the rolling start temperature is 1000°C, the cutting and sizing temperature is 865°C, and the spinning temperature is 865°C;

[0034] (5) Increase the back blowing water function of the water tank;

[0035] (6) Control the amount of steel passed, and achieve the purpose of actually reducing the amount of steel passed by increasing the regulation of the amount of steel passed in intermediate rolling. The actual rolling tonnage of the rolling groove before rolling must be less than the set tonnage, as sho...

Embodiment 2

[0039] (1) The temperature in the heating furnace is set as follows: the heating stage 1 is 850°C, the heating stage 2 is 1050°C, and the soaking stage is 1100°C;

[0040] (2) Set the air-fuel ratio to 0.50-0.65;

[0041] (3) The high-pressure water dephosphorization setting water pressure is ≥12MPa;

[0042] (4) The temperature of each key point of the rolling line is: the rolling start temperature is 1030°C, the cutting and sizing temperature is 875°C, and the spinning temperature is 885°C;

[0043] (5) Increase the back blowing water function of the water tank;

[0044] (6) Control the amount of steel passed, and achieve the purpose of actually reducing the amount of steel passed by increasing the regulation of the amount of steel passed in intermediate rolling. The actual rolling tonnage of the rolling groove before rolling must be less than the set tonnage, as shown in Table 1.

[0045] In "Q320582 JYG20-2019 Cold Heading Steel Hot-Rolled Wire Rod for Light Drawing (Re...

Embodiment 3

[0048] (1) The temperature in the heating furnace is set as follows: heating section 1 is 900°C, heating section 2 is 1090°C, and soaking section is 1150°C;

[0049] (2) Set the air-fuel ratio to 0.50-0.65;

[0050] (3) The high-pressure water dephosphorization setting water pressure is ≥12MPa;

[0051] (4) The temperature of each key point of the rolling line is: the rolling start temperature is 1060°C, the cutting and sizing temperature is 895°C, and the spinning temperature is 905°C;

[0052] (5) Increase the back blowing water function of the water tank;

[0053] (6) Control the amount of steel passed, and achieve the purpose of actually reducing the amount of steel passed by increasing the regulation of the amount of steel passed in intermediate rolling. The actual rolling tonnage of the rolling groove before rolling must be less than the set tonnage, as shown in Table 1.

[0054] In "Q320582 JYG20-2019 Cold Heading Steel Hot-Rolled Wire Rod for Light Drawing (Review D...

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Abstract

The invention belongs to the field of metallurgy, and particularly relates to a production process for solving pitted surfaces of low-carbon steel wires. According to the production process, by takingthe actual quality of the surfaces of rolling grooves of all sorts of rough and medium rolling as the purpose, the rolling temperature is improved, in other words, heating secondary section temperature, soaking zone temperature and initial rolling temperature are increased by 30 DEG C, and spinning temperature is increased by 30-40 DEG C ; the back flushing function of a water tank is added; andthe steel capacity of intermediate rolling is reduced, and the pitted surface depth of the large-specification low-carbon steel wires is reduced to 0.04 mm or below. The use requirements of customersfor drawing from phi 26mm to phi 25.5 mm for forming of a socket spanner are met.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular to a production process for solving pitting on the surface of low-carbon steel wire rods. Background technique [0002] Defects on the surface of low-carbon steel usually cause deformation and cracking of low-carbon steel during processing (cold heading, hot forging, drawing, etc.), which will affect the surface quality of the final product. Common defects in low carbon steel include inclusions, gas or cracks. [0003] Non-metallic compounds that are insoluble in the metal matrix are called inclusions. Common inclusions such as sulfides, oxides, silicates, etc. Inclusions change the forging properties of steel ingots. For example, when there are too many low-melting point inclusions at the grain boundaries, the steel ingots will crack due to hot embrittlement during forging. The inclusions cannot be eliminated, but they can be broken by a proper forging process, or the dense inclusions ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/00B21B37/74B21B45/08B21B45/02
CPCB21B37/00B21B37/74B21B45/08B21B45/0203Y02P10/20
Inventor 李文杰王荣辉纪文杰
Owner JIANGSU YONGGANG GROUP CO LTD
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