CrMn spring steel bloom and one-heating preparation method thereof

Abstract

The invention discloses a CrMn spring steel bloom and a one-heating preparation method thereof. The bloom comprises the following chemical components: 0.52-0.64% of C, no more than 0.50% of Si, 0.65-1.0% of Mn, 0.65-0.95% of Cr, and the balance Fe and unavoidable impurities. The spring steel is uniform and compact in structure, the decarburization layer depth of the spring steel is low, the ferrite content of a decarburization layer is low, and the decarburization control requirement of the spring steel for a stabilizer bar is met; the surface of the spring steel is good; and according to thepreparation method, proper heating and rolling rhythm are combined with gas control, and the decarburization layer depth of the 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...

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

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