Forging method for large-specification crystallization roller steel forged piece

Abstract

The invention relates to a forging method for a large-specification crystallization roller steel forged piece. The forging method comprises the steps that a raw material is fed into a furnace and thensubjected to heat preservation at the temperature of 400-450 DEG C, the temperature is increased to 850+ / -10 DEG C at the rate of no greater than 50 DEG C / h, then preserved, then increased to 1000+ / -10 DEG C at the rate of no greater than 80 DEG C / h, afterwards increased to 1180+ / -10 DEG C and preserved, and the piece is discharged out of the furnace and forged, specifically, the upsetting speedis controlled during forging, the piece is forged on an upper flat anvil being 700 mm wide and a lower V-shaped anvil of 135 degrees while being subjected to drawing deformation, the rolling reductionof the first pass is controlled to be 30-50 mm, the rolling reduction of the second pass is controlled to be 50-80 mm, then main deformation of high rolling reduction is conducted, the rolling reduction of each pass is 120-150 mm, the anvil stagger amount of each pass is at least 50 mm, and forging deformation is in a pulling impact or pushing impact mode; and nicking is conducted after the pieceis drawn to be of a certain dimension, a hammer is changed to perform forging deformation on upper and lower flat anvils being 700 mm wide, pushing impact forging is conducted from the end portion tothe inside, deformation control is conducted in a half anvil feeding mode with small rolling reduction, forging cracking and end surface pits can be avoided, the problems of post-forging coarse grains and unqualified ultrasonic exploration can be solved, and the requirements for texture, strength and toughness after tempering can be met.

Description

technical field [0001] The invention belongs to the technical field of iron and steel material manufacturing process control, relates to a forging technical field, in particular to a forging method for large-sized crystalline roll steel forgings for processing large-sized crystalline roll forgings, that is, 1Cr13 large-sized shafts, which can avoid forging Cracking and concavity of the end face, solving the unqualified problems of coarse grain and super-exploration after forging, and meeting the requirements of the microstructure and strength and toughness after quenching and tempering. Background technique [0002] At present, the conventional production method for forging 1Cr13 crystalline roller forgings is: to heat the group III steel according to the general technical requirements for free forging heating, and to use oil (water) press for forging. There are coarse grains after forging and unqualified ultrasonic waves, which seriously affect the production efficiency and...

AI Technical Summary

Problems solved by technology

[0002] At present, the conventional production method for forging 1Cr13 crystalline roller forgings is: to heat the group III steel according to the general technical requirements for free forging heating, and to use oil (water) press for forging. There are problems of coarse grain after forging and unqualified ultrasonic waves, which seriously affect the production efficiency and the structure and mechanical properties after quenching and tempering. The product quality is poor and the pass rate is extremely low.

The traditional 1Cr13 forging manufacturing method, the pre-forging heating specification and the forging process are similar to ordinary alloy structural steel, resulting in 1Cr13 forging cracking and serious end surface concavity during the forging process, greatly reducing material utilization and product qualification rate, seriously increasing production costs and Extend the production cycle

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