CN103276162A - Heat-treatment machining method of wear-resistant medium alloy steel castings - Google Patents

Heat-treatment machining method of wear-resistant medium alloy steel castings Download PDF

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Publication number
CN103276162A
CN103276162A CN2013101975432A CN201310197543A CN103276162A CN 103276162 A CN103276162 A CN 103276162A CN 2013101975432 A CN2013101975432 A CN 2013101975432A CN 201310197543 A CN201310197543 A CN 201310197543A CN 103276162 A CN103276162 A CN 103276162A
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China
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hours
heat
wear
alloy steel
casting
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CN2013101975432A
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Chinese (zh)
Inventor
顾鹏
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JIANGSU SHUANGXING SPEICAL STEEL Co Ltd
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JIANGSU SHUANGXING SPEICAL STEEL Co Ltd
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Priority to CN2013101975432A priority Critical patent/CN103276162A/en
Publication of CN103276162A publication Critical patent/CN103276162A/en
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Abstract

The invention relates to the field of heat-treatment machining, in particular relates to a heat-treatment machining method of wear-resistant medium alloy steel castings. The heat-treatment machining method comprises the following steps of: heating a casting with the wall thickness of 40-120mm from 0 DEG C to 380 DEG C through two hours, and preserving for one hour after the temperature rises to 380 DEG C; heating the casting from 380 DEG C to 620 DEG C through two hours, and preserving for one hour after the temperature rises to 620 DEG C; heating the casting from 620 DEG C to 950 DEG C through three hours; quenching: preserving for three hours after the temperature rises to 950 DEG C, and oil cooling; and performing low-temperature tempering: heating to 380 DEG C, and air cooling after preserving heat for four to five hours. According to the method, the problems that casting products generally have serious dendritic segregation and uneven internal organization and crystalline grains are coarse are solved. Through a heat-treatment technology, the influence of harmful substances is eliminated or reduced, and the mechanical properties of toughness and hardness of the products are improved. The service life of the products achieves more than 18-30 months.

Description

The heat treatment process method of wear-resisting Medium Alloy Steel foundry goods
Technical field
The present invention relates to the heat treatment process field, particularly relate to A kind of heat treatment process method of wear-resisting Medium Alloy Steel foundry goods
Background technology:
At the eighties initial stage, the wear-resisting steel part of the widely used middle-size and small-size ball milling mechanized equipment of China, it is char combustion steel part, the foundry goods mode that adopts the pool, ground stove formula, carries out air cooling or water-cooled heat treatment process method again, is widely used in industries such as cement, mineral products, electric power.Traditional heat treatment process method product processed is of poor quality, and only have about 10 months work-ing life.Along with the development of social science and technology, improve environmental protective measure, impel replacements of throwing away the old and change into the new of ball milling machinery, the medium requirement of the ball milling machinery ball milling of wanting is improved constantly the effect of the necessary high-power physical impact grinding that suits.Demonstration through the plumber, transform the innovation thermal treatment process technology, to satisfy the toughness of quality product, good comprehensive physicals such as hardness is index, especially to the research of the above grinding machine accessory of Ф 3m, in grinding mill barrel, carry steel ball, mill is forged and the more large impact of material pulverizes, also to keep certain cyclic stress, should grasp the interaction of cast alloy and carbon, control as-cast structure and solidification and crystallization process by using, product to casting, more serious skill crystalline substance and the segregation of general existence, the inherence is organized extremely inhomogeneous, problems such as crystal grain is thick should or alleviate harmful effect by the heating technique elimination, reach the mechanical property of improving toughness of products and hardness.On the difference of product structure and wall thickness, the reflection of product position has different structural states, can produce sizable residualinternal stress during use, must consider the stress factors of cross section effect and casting.Facts have proved, through the present invention Heat treated wear resisting steel foundry goods, not only economy but also practicality satisfy existing required performance and the service requirements of the above grinding machine accessory of Ф 3m fully.
Summary of the invention:
It is a kind of that purpose of the present invention will provide exactly The heat treatment process method of wear-resisting Medium Alloy Steel foundry goods, it can save cost, prolongs the work-ing life of equipment.The object of the present invention is achieved like this, the heat treatment process method of wear-resisting Medium Alloy Steel foundry goods, it is characterized in that: casting section thickness is 40-120 ㎜, and from O ℃ heat temperature raising to 380 ℃, the time is 2 hours, insulation is 1 hour after 380 ℃, be warming up to 620 ℃ from 380 ℃, the time is 2 hours, and insulation is 1 hour after 620 ℃, 620 ℃ are warming up to 950 ℃, and the time is 3 hours; Quench: insulation is 3 hours after being warming up to 950 ℃, oil cooling; Low-temperaturetempering: be heated to 380 ℃, be incubated air cooling after 4-5 hour.What Equipment for Heating Processing adopted isThe box full fiber car type furnace of RE-210-12.What cooling apparatus adopted is the large-scale capacity oil sump of NET200C. The present inventionGrasped the interaction of cast alloy and carbon, control as-cast structure and solidification and crystallization process by using.To the difference of structure and wall thickness, the reflection of product position has different structural states, has considered the stress factors of cross section effect and casting.Problems such as cast article is general to exist more serious skill crystalline substance and segregation, and the inherence is organized extremely inhomogeneous, crystal grain is thick have been solved.Eliminate or reduced the influence of objectionable impurities by heat treatment technics, reached the mechanical property of improving toughness of products and hardness.Guarantee that product reaches more than 18-30 month work-ing life.
Description of drawings
Fig. 1 is heat treatment cycle curve figure of the present invention.
Embodiment
The present invention adopts multi-functional GC electronic digital control instrument, the box full fiber car type furnace of RE-210-12, the large-scale capacity oil sump of NET200C and various relevant device, divides three key elements to implement to thermal treatment process.
Heat treated: distinguish speed and the mode that material wall thickness device advances the stove internal heating when wear-resisting steel part, guarantee thermally equivalent, just indeformable.General three steps of branch carry out From O ℃ heat temperature raising to 380 ℃, the time is 2 hours; Be warming up to 620 ℃ from 380 ℃, the time is 2 hours; 620 ℃ are warming up to 950 ℃, and the time is 3 hours.
Insulation is handled: be elemental composition and the requirement property according to the austenitizing of wear-resisting steel part, in the selected period, make product surface and internal temperature and homogeneous microstructure processing. Insulation is 1 hour after being warming up to 380 ℃, be warming up to 620 ℃ from 380 ℃ after insulation 1 hour, 620 ℃ be warming up to 950 ℃ after insulation 3 hours.The wear-resisting steel part of interalloy is longer than cast carbon steel spare soaking time, and the every 25mm of insulation wall thickness is incubated 1 hour, and every increase 15mm will prolong insulation 1 hour; Will consider during design tempering insulation correlation time to be incubated factors such as each Elements Diffusion toggle speed, its soaking time should be than normalizing or about long 1.5-2 of cool time times.
Cooling process: to the oil quenching cooling of wear-resisting steel part, can take different speed to finish metallographic transition process in the steel, make the metallographic structure balance, and reach each data demand performance index.Material property after the thermal treatment is to determine in heating and cooling condition difference.In the thermal treatment process technology operating process, can take annealing, normalizing homogenizing to handle according to customer requirements, quenching, tempering and solution treatment finally obtain the index of physics and chemistry key element series.
Embodiment 1 is with the present invention Thermal treatment process processing
Name of product is wear-resisting steel liner plate, and specifications and models are interalloy, and sampling basic number is 150Kg;
Chemical Composition Interventions Requested technical requirements assay
C ,% 0.3-0.45 0.38
Si ,% 1.0-1.7 1.7
Mn ,% 0.6-1.3 1.2
P ,% ≤0.035 0.018
S ,% ≤0.03 0.01
Cr ,% 1.5-2.2 1.8
Tensile strength Rm N/ ㎜ 2 〉=500 1300
Elongation after fracture A, % 〉=2 2.3
Hardness HRC 〉=35 51.3; 52.0; 52.0
Open impact toughness J/cm2 〉=25 50 not; 68; 70
The product that the present invention produces by Jiangsu Supervision and Inspection Institute for Product Quality according to GB/T4336-2002[carbon steel and middle-low alloy steel spark source Atomic Emission Spectral Analysis method (conventional method)], GB/T228.1-2010[metal material stretching test part 1: the room temperature test method], the GB/T229-2007[metallic substance summer is than pendulum impact test method], GB/T230.1-2009[metallic substance Rockwell hardness test part 1: test method (A, B, C, D, E, F, G, H, K, N, T scale)] check, assay is qualified.

Claims (3)

1. the heat treatment process method of wear-resisting Medium Alloy Steel foundry goods, it is characterized in that: casting section thickness is 40-120 ㎜, from O ℃ heat temperature raising to 380 ℃, time is 2 hours, and insulation is 1 hour after 380 ℃, is warming up to 620 ℃ from 380 ℃, time is 2 hours, insulation is 1 hour after 620 ℃, and 620 ℃ are warming up to 950 ℃, and the time is 3 hours; Quench: insulation is 3 hours after being warming up to 950 ℃, oil cooling; Low-temperaturetempering: be heated to 380 ℃, be incubated air cooling after 4-5 hour.
2. the heat treatment process method of wear-resisting Medium Alloy Steel foundry goods is characterized in that: what Equipment for Heating Processing adopted is the box full fiber car type furnace of RE-210-12.
3. the heat treatment process method of wear-resisting Medium Alloy Steel foundry goods is characterized in that: what cooling apparatus adopted is the large-scale capacity oil sump of NET200C.
CN2013101975432A 2013-05-24 2013-05-24 Heat-treatment machining method of wear-resistant medium alloy steel castings Pending CN103276162A (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
CN2013101975432A CN103276162A (en) 2013-05-24 2013-05-24 Heat-treatment machining method of wear-resistant medium alloy steel castings

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103484620A (en) * 2013-09-26 2014-01-01 无锡阳工机械制造有限公司 Medium carbon steel quenching method
CN104087842A (en) * 2014-06-26 2014-10-08 宁国市正兴耐磨材料有限公司 Medium-chromium wear-resistant lining board

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101597678A (en) * 2008-06-03 2009-12-09 顾开明 A kind of working method of wear resisting steel interalloy liner plate
CN101597683A (en) * 2008-06-03 2009-12-09 顾开明 The working method of carbon alloy liner plate in a kind of wear resisting steel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101597678A (en) * 2008-06-03 2009-12-09 顾开明 A kind of working method of wear resisting steel interalloy liner plate
CN101597683A (en) * 2008-06-03 2009-12-09 顾开明 The working method of carbon alloy liner plate in a kind of wear resisting steel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103484620A (en) * 2013-09-26 2014-01-01 无锡阳工机械制造有限公司 Medium carbon steel quenching method
CN104087842A (en) * 2014-06-26 2014-10-08 宁国市正兴耐磨材料有限公司 Medium-chromium wear-resistant lining board
CN104087842B (en) * 2014-06-26 2016-09-07 宁国市正兴耐磨材料有限公司 Chromium abrasion-proof backing block in one

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