CN105506493A - Production method of ultrathin SA738Gr B steel plate - Google Patents

Abstract

The invention relates to an ultrathin SA738 Gr? B, a production method of a steel plate, wherein the steel plate comprises 0.1-0.2% of C, 0.15-0.37% of Si, 1.0-1.7% of Mn1, less than or equal to 0.5% of Cr, less than or equal to 0.02% of V and the balance of Fe and inevitable impurities by weight; the method comprises the following process steps: 1) cogging: cogging 300mm of blank at high temperature under large pressure to a thickness of 100-130 mm, wherein the cogging temperature is 1200 +/-30 ℃, and the reduction rate is more than or equal to 10% and less than or equal to 30%; 2) rolling: heating again, wherein the initial rolling temperature is more than or equal to 1000 ℃, and the reduction rate is more than or equal to 10% and less than or equal to 30%; 3) and (3) heat treatment: and (4) quenching and tempering. The invention has the advantages that: with this production method, SA738 Gr? And B, the performance of the steel plate also meets the performance standard.

Description

A kind of production method of ultra-thin SA738Gr B steel plate

Technical field

The present invention relates to a kind of production method of ultra-thin SA738GrB steel plate.

Background technology

SA738GrB steel plate is middle low temperature carbon Manganese Silicon Steel plate, is usually used in nuclear island level steel plate on nuclear power engineering, surrender and tensile strength higher, surrender generally want >=415Mpa, tension, at 585 ~ 700Mpa, examine less than-18 DEG C low-temperature impacts, modulate state deliver goods.At present, the midium-carbon steel SA738GrB thickness specification of producing both at home and abroad is greater than 20mm mostly, and thickness is less than 20mm production difficulty very greatly, and plate shape, performance are all not easily qualified.

Summary of the invention

For overcoming the deficiencies in the prior art, the object of this invention is to provide a kind of production method of ultra-thin SA738GrB steel plate, producing the SA738GrB steel plate that the thickness meeting standard of performance is 10mm-20mm.

For achieving the above object, the present invention is achieved through the following technical solutions:

A production method for ultra-thin SA738GrB steel plate, operational path is cogging → rolling → thermal treatment, and steel plate comprises C0.1% ~ 0.2% by weight, Si0.15% ~ 0.37%, Mn1.0% ~ 1.7%, Cr≤0.5%, V≤0.02%, all the other are Fe and inevitable impurity; Specifically comprise following processing step:

1) cogging: adopt the large pressure cogging of high temperature to thickness 100 ~ 130mm 300mm blank, start rolling temperature 1200 ± 30 DEG C, 10%≤draft≤30%;

2) rolling: thickness is that the intermediate blank of 100 ~ 130mm heats again, start rolling temperature >=1000 DEG C, 10%≤draft≤30%;

3) thermal treatment: adopt modifier treatment, quenching and preserving heat temperature 915-925 DEG C, at stove total time 1.5 ~ 2.5min/mm, tempering holding temperature 590 ~ 610 DEG C, at stove total time 4 ~ 6min/mm.

Compared with prior art, the invention has the beneficial effects as follows:

By this production method, produce the SA738GrB steel plate of most minimal thickness 10mm, plate property also meets standard of performance.

Embodiment

Below the present invention is described in detail, but it should be noted that enforcement of the present invention is not limited to following embodiment.

The production method of ultra-thin SA738GrB steel plate, operational path is cogging → rolling → thermal treatment, and steel plate comprises C0.1% ~ 0.2% by weight, Si0.15% ~ 0.37%, Mn1.0% ~ 1.7%, Cr≤0.5%, V≤0.02%, all the other are Fe and inevitable impurity; Specifically comprise following processing step:

1) cogging: start rolling temperature 1200-1250 DEG C, 10%≤draft≤30%, cogging is to thickness 100 ~ 130mm;

2) rolling: thickness is that the intermediate blank of 100 ~ 130mm heats again, start rolling temperature palpus >=1000 DEG C, 10%≤draft≤30%;

3) thermal treatment: adopt modifier treatment, quenching and preserving heat temperature 915-925 DEG C, at stove total time 1.5-2.5min/mm, tempering holding temperature 590 ~ 610 DEG C, at stove total time 4-6min/mm.

Embodiment:

Steel plate principal element comprises C0.15% ~ 0.15%, Si0.2% ~ 0.3%, Mn1.2% ~ 1.5%, Cr≤0.4%, V≤0.015%, and all the other are Fe and inevitable impurity, specifically comprise the following steps:

1) cogging: adopt the large pressure cogging of high temperature to thickness 100mm 300mm blank, start rolling temperature 1200 DEG C, 10%≤draft≤25%;

2) rolling: 100mm intermediate blank heats again, start rolling temperature palpus >=1000 DEG C, 10%≤draft≤25%;

3) thermal treatment: adopt modified, quenching and preserving heat temperature 920 DEG C, at stove total time 2min/mm, tempering insulation time 600 DEG C, at stove total time 5min/mm;

By this production method, produce the SA738GrB steel plate of most minimal thickness 10mm, plate property also meets standard of performance, and specific performance is as following table:

The present invention is by this production method, and produce the SA738GrB steel plate of most minimal thickness 10mm, plate property also meets standard of performance.

Claims (1)

1. the production method of a ultra-thin SA738GrB steel plate, operational path is cogging → rolling → thermal treatment, it is characterized in that, steel plate comprises C0.1% ~ 0.2% by weight, Si0.15% ~ 0.37%, Mn1.0% ~ 1.7%, Cr≤0.5%, V≤0.02%, all the other are Fe and inevitable impurity; Specifically comprise following processing step:

1) cogging: adopt the large pressure cogging of high temperature to thickness 100 ~ 130mm 300mm blank, start rolling temperature 1200 ± 30 DEG C, 10%≤draft≤30%;

2) rolling: thickness is that the intermediate blank of 100 ~ 130mm heats again, start rolling temperature >=1000 DEG C, 10%≤draft≤30%;

3) thermal treatment: adopt modifier treatment, quenching and preserving heat temperature 915-925 DEG C, at stove total time 1.5 ~ 2.5min/mm, tempering holding temperature 590 ~ 610 DEG C, at stove total time 4 ~ 6min/mm.