A kind of crmn spring steel bloom and its one-fired preparation method

A technology of bloom and spring steel, applied in the field of CrMn spring steel bloom and its one-fired product preparation, can solve the problem of small compression ratio, unfavorable control of microstructure uniformity and compactness, unfavorable decarburization control of spring steel, low heating temperature, etc. problem, to achieve the effect of good depth control of decarburization layer, good density and sufficient fragmentation

Active Publication Date: 2022-03-22
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of secondary heating is that the compression ratio is large, the double heating is beneficial to ensure the uniformity and compactness of the material, and the surface quality is better; the disadvantage is that the cost is high, and the secondary heating is not good for the decarburization control of spring steel.
The advantage of secondary heating is that the compression ratio is large, and the double heating is beneficial to the guarantee of material uniformity and compactness; the disadvantage is that the cost is high, and the double heating is not good for the decarburization control of spring steel.
The advantages of billet firing into material are short process, which is conducive to high-efficiency production, low cost, and low rolling heating temperature is conducive to decarburization control; the disadvantage is that the small compression ratio is not conducive to the control of structure uniformity and compactness

Method used

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  • A kind of crmn spring steel bloom and its one-fired preparation method
  • A kind of crmn spring steel bloom and its one-fired preparation method
  • A kind of crmn spring steel bloom and its one-fired preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Using 250mm*300mm spring steel SUP9DZL continuous casting billet, rolled into diameter The standard SUP9D spring round steel process flow is: BOF converter smelting, LF refining furnace, RH treatment, bloom continuous casting, stack cooling, step-by-step continuous heating furnace heating (preheating section temperature: 650-660°C, heating section temperature : 860-890°C, second stage heating temperature: 1010-1020°C, soaking stage one temperature: 1080-1090°C, second soaking stage temperature: 1090-1100°C, final rolling temperature: 800°C total heating time: 187-190min .Gas: blast furnace gas, high-coke mixed gas), 20-pass rolling (10-pass initial rolling + 10-pass intermediate rolling), 4-pass pre-finish rolling, 4-pass KOCKS mill finish rolling, inspection, flaw detection (UT+ET), inspection, packaging, metering, storage.

[0026] The finished material produced by this process has excellent physical and chemical testing performance, good surface condition, and the ...

Embodiment 2

[0038] Using 250mm*300mm spring steel 55Cr3ZL continuous casting billet, rolled into diameter The standard 55Cr3 spring round steel process is: converter smelting, LF refining furnace, RH treatment, bloom continuous casting, stack cooling, step-by-step continuous heating furnace heating (preheating section temperature: 780-800 ℃, heating section temperature: 920-930℃, second heating stage temperature: 1060-1080℃, soaking first stage temperature: 1090-1100℃, soaking second stage temperature: 1110-1120℃, final rolling temperature: 860℃; total heating time: 215-228min .Gas: blast furnace gas, high-coke mixed gas), 20-pass rolling (10-pass initial rolling + 10-pass intermediate rolling), 4-pass pre-finish rolling, 4-pass KOCKS mill finish rolling, inspection, flaw detection (UT+ET), inspection, packaging, metering, storage.

[0039] The finished material produced by this process has excellent physical and chemical testing performance and good surface condition. The compression r...

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PUM

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Abstract

The invention discloses a CrMn spring steel bloom and a preparation method thereof. The bloom includes the following chemical components: C 0.52-0.64%, Si≤0.50%, Mn 0.65-1.0%, Cr 0.65-0.95%, The rest is Fe and unavoidable impurities, and the preparation method of the bloom is provided. The spring steel structure of the present invention is uniform and dense, the decarburization layer depth of the spring steel is low, and the ferrite content of the decarburization layer is low, which meets the decarburization control requirements of the spring steel used for the stabilizer bar; the surface of the spring steel is good; the preparation method is suitable Combining heating and rolling rhythm with gas control, the depth of decarburization layer of finished spring steel is well controlled.

Description

technical field [0001] The invention relates to a spring steel bloom and a preparation method thereof, in particular to a CrMn spring steel bloom and a preparation method thereof. Background technique [0002] The automobile stabilizer bar is one of the important parts of the automobile chassis system. The main materials of the stabilizer bar are Si-Mn series, CrMn series, SiCrV series spring steel rods and alloy structural steel pipes that have emerged in recent years. The main specifications of spring steel bars for automobile stabilizer bars are φ15-27mm. The current main production process includes secondary combustion of blooms (electric furnace / converter smelting, refining outside the furnace, vacuum treatment, continuous casting of blooms, billet opening, billet finishing and grinding, Hot-rolled lumber), billet into lumber (electric furnace / converter smelting, refining outside the furnace, vacuum treatment, continuous casting (billet shape is generally less than 240m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C33/04C21D8/00
CPCC22C38/02C22C38/04C22C38/18C22C33/04C21D8/005
Inventor 李秋志刘文学江野郑宏伟江雁吕志华王凯迪
Owner NANJING IRON & STEEL CO LTD
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