CN107641755A

CN107641755A - A kind of forging and its manufacturing process with high/low-temperature impact performance

Info

Publication number: CN107641755A
Application number: CN201610575517.2A
Authority: CN
Inventors: 许建平
Original assignee: WUXI FLANG FORGING CO Ltd
Current assignee: WUXI FLANG FORGING CO Ltd
Priority date: 2016-07-21
Filing date: 2016-07-21
Publication date: 2018-01-30

Abstract

The present invention provides a kind of forging and its manufacturing process with high/low-temperature impact performance, and each chemical composition proportion is in its material：Cr：1.40% ~ 1.50%, Mo：0.55% ~ 0.65%, C：0.15% ~ 0.20%, Si：0.50% ~ 1.00%, Mn：0.30% ~ 0.80%, P：0.040%, S：0.040%, the flange forge piece of resistant to hydrogen steel material provided by the invention, adjustment C, Cr, Mo content in terms of chemical composition, in forging process, technique is pulled out using multiple Upsetting, the impact property of material is improved, normalizing+tempering process is used in heat treatment process, it is tempered sorbite to control forging microstructure, meets elevated temperature strength and low temperature impact properties.

Description

A kind of forging and its manufacturing process with high/low-temperature impact performance

Technical field

The invention mainly relates to metal forging field, more particularly to a kind of forging and manufacture with high/low-temperature impact performance Technique.

Background technology

In recent years, due to geopolitics and product price factor, large quantities of Far-east Area of Russia forging orders can be obtained, are forged The purposes of part is changed and is used for device fabrication and in-service maintenance of equipment, and forging number is more, and has this order demand every year.

But the existing mechanical property of materials produced of forging processing technology is not strong, corrosion-resistant was, it is necessary to both Extremely cold low-temperature test is done, does hot test again, acceptance condition is：In 370 DEG C of high temperature tension tests, tensile strength >= 483MPa, yield strength >=208.6MPa；Do -46 DEG C of impact tests, ballistic work >=68J.

The content of the invention

The present invention provides a kind of forging with high/low-temperature impact performance, in its material it is each it is chemical into

Point proportion is：Cr：1.40% ~ 1.50%, Mo：0.55% ~ 0.65%, C：0.15% ~ 0.20%, Si：0.50% ~ 1.00%, Mn：0.30% ~ 0.80%, P：0.040%, S：0.040%.

Present invention also offers the manufacturing process of the flange forge piece for producing the high steel material of above-mentioned resistant to hydrogen performance, including Smelt, forge, heat treatment.

Preferably, it is described heat treatment include quench and be tempered, heat treatment parameter for hardening heat 850 DEG C ~ 900 DEG C it Between, soaking time is calculated by 1.2 ~ 1.5min/mm, and tempering time is calculated by 2.5 ~ 3.0min/mm, minimum to be no less than 2 hours.

Preferably, taken in forging process at least twice Upsetting pull out technique.

Beneficial effects of the present invention：The flange forge piece of resistant to hydrogen steel material provided by the invention, chemical composition aspect adjustment C, Cr, Mo content, in forging process, technique is pulled out using multiple Upsetting, the impact property of material is improved, is used in heat treatment process Normalizing+tempering process, it is tempered sorbite to control forging microstructure, meets elevated temperature strength and low temperature impact properties.

Embodiment

In technical scheme provided by the invention, steel ingot raw material should use aluminium deoxidation inherent fine grain

Steel, effectively controls grain size, and each chemical composition proportion is in material：

Cr：1.40% ~ 1.50%, Mo：0.55% ~ 0.65%, C：0.15% ~ 0.20%,

Si：0.50% ~ 1.00%, Mn：0.30% ~ 0.80%, P：0.040%, S：0.040%, wherein, C content should be use up The possible close upper limit.

Preferably, in forging technology, steel ingot is fully forged, eliminates as-cast structure, tiny flaw is closed in forging, and increase material causes Density, these measures can greatly improve the impact property of material, and taken in forging process at least twice Upsetting pull out technique, total forging Make not less than 6.Increase the deflection of last fire time, it is desirable to which last fiery deflection is not less than the 20% of total deformation.

Preferably, the heat treatment includes quenching and is tempered, and it is with excellent summation mechanicalness to control forging microstructure Can tempered sorbite, heat treatment parameter be hardening heat between 850 DEG C ~ 900 DEG C, to obtain thinner crystal grain, quenching temperature Degree should be as low as possible, and soaking time is calculated by 1.2 ~ 1.5min/mm, and tempering time is calculated by 2.5 ~ 3.0min/mm, minimum many In 2 hours.

The principle and its effect of above-described embodiment only illustrative present patent application, not for limitation this patent Shen Please.Any person skilled in the art can all be carried out under the spirit and scope without prejudice to present patent application to above-described embodiment Modifications and changes.Therefore, such as those of ordinary skill in the art without departing from the essence disclosed in present patent application God is covered with all equivalent modifications or change, the claim that should be asked by this patent completed under technological thought.

Claims

A kind of 1. forging with high/low-temperature impact performance, it is characterised in that：Each chemical composition proportion is in its material：Cr： 1.40% ~ 1.50%, Mo：0.55% ~ 0.65%, C：0.15% ~ 0.20%, Si：0.50% ~ 1.00%, Mn：0.30% ~ 0.80%, P：0.040%, S：0.040%.
2. a kind of manufacturing process of forging with high/low-temperature impact performance for described in claim 1, including smelt, forge Make, be heat-treated.
3. the manufacturing process of the forging according to claim 2 with high/low-temperature impact performance, it is characterised in that：The heat treatment Including quenching and being tempered, heat treatment parameter be hardening heat between 850 DEG C ~ 900 DEG C, soaking time presses 1.2 ~ 1.5min/mm Calculate, tempering time is calculated by 2.5 ~ 3.0min/mm, minimum to be no less than 2 hours.
4. the manufacturing process of the forging according to claim 2 with high/low-temperature impact performance, it is characterised in that：Forged Taken in journey at least twice Upsetting pull out technique.