CN102230140B - Martensitic wear resistant steel production technology - Google Patents
Martensitic wear resistant steel production technology Download PDFInfo
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- CN102230140B CN102230140B CN2010101573426A CN201010157342A CN102230140B CN 102230140 B CN102230140 B CN 102230140B CN 2010101573426 A CN2010101573426 A CN 2010101573426A CN 201010157342 A CN201010157342 A CN 201010157342A CN 102230140 B CN102230140 B CN 102230140B
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Abstract
The invention particularly relates to martensitic wear resistant steel and a production technology for steel casting thereof, belonging to the technical field of wear resistant steel in iron and metal metallurgy and foundry industry. Chemical components in the novel martensitic wear resistant steel comprise, by weight, C 0.3% to 0.5%, Si 0.8% to 1.5%, Cr 2.1% to 2.5%, Mn 0.8% to 1.5%, Ni 0.7% to 1.2%, Mo, 0.6% to 1.0%, Nb 0.1% to 0.3%, Ti 0.1% to 0.5%, Re 0.04% to 0.05%, and P and S no more than 0.04, with the balance being Fe. The production technology for steel casting comprises a smelting process, a casting process, a heat treatment process and quality inspection. The novel martensitic wear resistant steel provided in the invention can be used for liner plates of ball mills, hammerheads of hammer mills or the like used in metallurgic mines under the condition of low impact, is applicable to wear resistant products used in various mines like gold mines, iron mines and cement quarries, and is a novel wear resistant material capable of substituting conventional high manganese steel. According to results of utilization in ore dressing factories for iron ore and cement, the novel martensitic wear resistant steel has an improved service life 2 to 2.3 times longer than the high manganese steel.
Description
Technical field
The invention belongs to the wear resisting steel technical field in the ferrous metallurgy foundry industry, particularly relate to a kind of martensite wear-resistant steel and steel casting production technology thereof.
Background technology
Develop very fast recent years both at home and abroad on metallurgical wear resistant products, and also extremely all circles pay attention to.Domestic and international all in the new material and the novel method of seeking to replace high mangaenese steel to produce with steel alloy, but produce little effect.Subject matter is that the wear resistance of steel alloy has improved, but toughness is very low, is prone in use produce fracture, is difficult to satisfy request for utilization.
Summary of the invention
The purpose of this invention is to provide a kind of martensite wear-resistant steel.
Another object of the present invention provides a kind of steel casting production technology of martensite wear-resistant steel.
The present invention is through studying a kind of new material wear resisting steel under low impact; Be applied in the ball grinding machine lining board of metallurgical mine, the tup of hammer ore deposit machine etc.; Being applicable to the wear resistant products in all kinds of mines such as gold mine, iron ore, cement, is the new high-abrasive material that replaces traditional high mangaenese steel.
The objective of the invention is to realize through following technical proposals:
Martensite wear-resistant steel of the present invention is characterized in that quantizing to learn composition by weight percentage is: C:0.3%～0.5%, Si:0.8%～1.5%; Cr:2.1%～2.5%, Mn:0.8%～1.5%, Ni:0.7%～1.2%, Mo:0.6%～1.0%; Nb:0.1%～0.3%, Ti:0.1%～0.5%, Re:0.04%～0.05%; P, S≤0.04, surplus are iron.
The described composition that quantizes by weight percentage is preferably: C:0.35%～0.45%, Si:0.8%～1.5%, Cr:2.1%～2.5%; Mn:0.8%～1.2%, Ni:0.7%～1.0%, Mo:0.6%～1.0%; Nb:0.1%～0.3%, Ti:0.1%～0.15%, Re:0.04%～0.05%; P, S≤0.04, surplus are iron.
The foundation and the reason of preferred chemical ingredients:
(1) in steel, adds ductility and the erosion resistance that niobium (Nb) can increase steel.Niobium at normal temperatures not with air in oxygen generation chemical reaction.Chloroazotic acid can disappear platinum, gold molten, is placed in the dense hot nitric acid two months to niobium or in chloroazotic acid six months, and niobium is safe and sound, and niobium plays resistance to corrosion in this material, and it selects 0.1%～0.3% to be advisable in this material role.
(2) nickel (Ni) adding 0.4% just can significantly improve the Chinese People's Anti-Japanese Military and Political College's gas and the weak acid corrosive ability of steel, and along with the raising of Ni content, this ability increases.Ni is non-carbide forming element, can be solid-solubilized in to play the solution strengthening effect among the α Fe.Ni can improve the hardening capacity of steel and the electropotential of matrix, reduces the microbattery effect in the corrosive medium, impels the matrix passivation, effectively reduces the speed of corrosive wear.Character with according to material of the present invention is preferably 0.7%～1.2%.
(3) chromium (Cr) plays outside the effects such as solution strengthening, crystal grain thinning, and Cr can form carbide, and is the strongest with the carbon avidity, more can in final tissue, form the wimet carbide that disperse distributes, and improves the initial hardness of steel, effectively increases wear resisting property.Obvious through testing Cr for many years greater than 1.6% o'clock role, 2.4% o'clock the best in this composition.
(4) molybdenum (Mo) mainly improves the hardening capacity of steel, improves the form and the distribution of carbide, prevents temper brittleness.Follow that to reach 0.5% o'clock role according to consumption effect Mo bigger, consider that the desirable lower limit that can reach above effect of production cost is advisable.
(5) Mo, Si, Nb combined action impel the steel surface to form fine and close sull, can improve the stability of steel in Oxidant, and the anti-corrosion wear performance of steel is improved.
(6) C chooses and should be 0.3%～0.5%, contains the C equivalent because increased behind the alloying element that this material adds, and increased value is about 0.3%; If comprehensive carbon content is hanged down and is reached martensitic stucture in the time of can not reaching thermal treatment; Can form perlite, can reduce mechanical property, influence wear resistance; If carbon content is too high, toughness is reduced, cause cracked.Therefore the carbon equivalent that contains of carbon must strict control.
A kind of steel casting production technology of described martensite wear-resistant steel is characterized in that comprising smelting technology, casting technique, thermal treatment process, quality inspection etc.
Described smelting technology adopts oxidation style to smelt, and at first adds steel scrap and melts, and adds Mo iron and copper subsequently, carries out oxygen blast at 68～72% o'clock in fusing and fluxes; And by molten steel weight 3% with slag former, furnace charge melts back chemical examination composition fully, skims then; Make new slag again, get into reduction period, successively add Cr iron, Mn iron, Ni iron and Nb iron; Carry out full composition analysis chemical examination behind the alloy material fine melt to be added, according to each element of result of laboratory test adjustment, after full composition is qualified; Before tapping, add slag former, when bits become white slag and reach tapping temperature, tap
Described casting technique adopts the clay-bonded sand moulding, and gating system adopts half sealed type pouring technology, if this part of steel casting thickness is above 120 millimeters; In moulding, take the further measure of crystal grain thinning tissue of external chill; Chill thickness is between 50 to 70 millimeters, and rising head is located at the thickest position of this part of steel casting, and rising head adopts heat preservation formula rising head; Shakeout temperature is controlled at foundry goods body temperature about 290～310 ℃
Described thermal treatment process: adopt normal temperature to go into stove; Heat 640～700 ℃ of insulations 110～130 minutes, rise to 875～985 ℃ of insulations then, per 25 millimeters this part of steel casting thickness insulation 60 minutes; Came out of the stove in 1 minute fast in the insulation back; Use oil quenching, carry out 250-350 ℃ of tempering insulation thermal treatment in 8 hours after the quenching immediately and finish
Described quality inspection comprises metallographic structure inspection and the hardness test after physical dimension inspection, the thermal treatment.
Described smelting technology is for adopting the electric arc furnace smelting technology of adjustable integralization composition; Perhaps adopt the intermediate frequency furnace smelting technology; Must detect and calculate the alloy material add-on when adopting the intermediate frequency furnace smelting technology, Cr, Mn scaling loss are by 10% control, and the Ti yield calculates by 60%.
Described tapping temperature is controlled at 1550 ℃ to 1570 ℃, and the teeming temperature in the described pouring technology is controlled between 1470 ℃ to 1490 ℃.
Described casting technique is used phenolic sand molding, and Feeder Design adopts the natural air cooling for being prone to cut side riser.
Whether metallographic structure after described thermal treatment inspection is lath martensite+retained austenite+disperse distribution carbide for the inspection metallographic structure, and lath martensite is high dislocation martensitic stucture, hardness test: Rockwell hardness HRC53-58, reach be limited to excellent.
New material wear resisting steel of the present invention is applied in the ball grinding machine lining board of metallurgical mine, the tup of hammer ore deposit machine etc. under low impact, be applicable to the wear resistant products that use in all kinds of mines such as gold mine, iron ore, cement, is the new high-abrasive material that replaces traditional high mangaenese steel.
On iron ore and cement dressing-works, use to show, improve 2～2.3 times than high mangaenese steel work-ing life.
Embodiment
Specify embodiment of the present invention below in conjunction with embodiment.
According to martensite wear-resistant steel of the present invention, it is characterized in that quantizing to learn composition by weight percentage is: C:0.3%～0.5%, Si:0.8%～1.5%; Cr:2.1%～2.5%, Mn:0.8%～1.5%, Ni:0.7%～1.2%, Mo:0.6%～1.0%; Nb:0.1%～0.3%, Ti:0.1%～0.5%, Re:0.04%～0.05%; P, S≤0.04, surplus are iron.
Embodiment
The described composition that quantizes by weight percentage is preferably: C:0.35%～0.45%, Si:0.8%～1.5%, Cr:2.1%～2.5%; Mn:0.8%～1.2%, Ni:0.7%～1.0%, Mo:0.6%～1.0%; Nb:0.1%～0.3%, Ti:0.1%～0.15%, Re:0.04%～0.05%; P, S≤0.04, surplus are iron.
A kind of steel casting production technology of described martensite wear-resistant steel is characterized in that comprising smelting technology, casting technique, thermal treatment process, quality inspection.
Described smelting technology adopts oxidation style to smelt, and at first adds steel scrap and melts, and adds Mo iron and copper subsequently, carries out oxygen blast at 68～72% o'clock in fusing and fluxes; And by molten steel weight 3% with slag former, furnace charge melts back chemical examination composition fully, skims then; Make new slag again, get into reduction period, successively add Cr iron, Mn iron, Ni iron and Nb iron; Carry out full composition analysis chemical examination behind the alloy material fine melt to be added, according to each element of result of laboratory test adjustment, after full composition is qualified; Before tapping, add slag former, when bits become white slag and reach tapping temperature, tap
Described casting technique adopts the clay-bonded sand moulding, and gating system adopts half sealed type pouring technology, if this part of steel casting thickness is above 120 millimeters; In moulding, take the further measure of crystal grain thinning tissue of external chill; Chill thickness is between 50 to 70 millimeters, and rising head is located at the thickest position of this part of steel casting, and rising head adopts heat preservation formula rising head; Shakeout temperature is controlled at foundry goods body temperature about 290～310 ℃
Described thermal treatment process: adopt normal temperature to go into stove; Heat 640～700 ℃ of insulations 110～130 minutes, rise to 875～985 ℃ of insulations then, per 25 millimeters this part of steel casting thickness insulation 60 minutes; Came out of the stove in 1 minute fast in the insulation back; Use oil quenching, carry out 250-350 ℃ of tempering insulation thermal treatment in 8 hours after the quenching immediately and finish
Described quality inspection comprises metallographic structure inspection and the hardness test after physical dimension inspection, the thermal treatment.
Described smelting technology is for adopting the electric arc furnace smelting technology of adjustable integralization composition; Perhaps adopt the intermediate frequency furnace smelting technology; Must detect and calculate the alloy material add-on when adopting the intermediate frequency furnace smelting technology, Cr, Mn scaling loss are by 10% control, and the Ti yield calculates by 60%.
Described tapping temperature is controlled at 1550 ℃ to 1570 ℃, and the teeming temperature in the described pouring technology is controlled between 1440 ℃ to 1490 ℃.
Described casting technique is used phenolic sand molding, and Feeder Design adopts the natural air cooling for being prone to cut side riser.
Whether metallographic structure after described thermal treatment inspection is lath martensite+retained austenite+disperse distribution carbide for the inspection metallographic structure, and lath martensite is high dislocation martensitic stucture, hardness test: Rockwell hardness HRC53-58, reach be limited to excellent.
New material wear resisting steel of the present invention is applied in the ball grinding machine lining board of metallurgical mine, the tup of hammer ore deposit machine etc. under low impact, be applicable to the wear resistant products that use in all kinds of mines such as gold mine, iron ore, cement, is the new high-abrasive material that replaces traditional high mangaenese steel.
On iron ore and cement dressing-works, use to show, improve 2～2.3 times than high mangaenese steel work-ing life.
Claims (6)
1. the steel casting production technology of a martensite wear-resistant steel is characterized in that comprising smelting technology, casting technique, thermal treatment process, quality inspection,
Described martensite wear-resistant steel quantizes to learn composition by weight percentage: C:0.3%～0.5%, Si:0.8%～1.5%, Cr:2.1%～2.5%, Mn:0.8%～1.5%; Ni:0.7%～1.2%, Mo:0.6%～1.0%, Nb:0.1%～0.3%; Ti:0.1%～0.5%, Re:0.04%～0.05%, P, S≤0.04; Surplus is an iron
Described smelting technology adopts oxidation style to smelt, and at first adds steel scrap and melts, and adds Mo iron and copper subsequently, carries out oxygen blast at 68～72% o'clock in fusing and fluxes; And by molten steel weight 3% with slag former, furnace charge melts back chemical examination composition fully, skims then; Make new slag again, get into reduction period, successively add Cr iron, Mn iron, Ni iron and Nb iron; Carry out full composition analysis chemical examination behind the alloy material fine melt to be added, according to each element of result of laboratory test adjustment, after full composition is qualified; Before tapping, add slag former, when bits become white slag and reach tapping temperature, tap
Described casting technique adopts the clay-bonded sand moulding, and gating system adopts half sealed type pouring technology, if this part of steel casting thickness is above 120 millimeters; In moulding, take the further measure of crystal grain thinning tissue of external chill; Chill thickness is between 50 to 70 millimeters, and rising head is located at the thickest position of this part of steel casting, and rising head adopts heat preservation formula rising head; Shakeout temperature is controlled at foundry goods body temperature at 290～310 ℃
Described thermal treatment process: adopt normal temperature to go into stove; Heat 640～700 ℃ of insulations 110～130 minutes, rise to 875～985 ℃ of insulations then, per 25 millimeters this part of steel casting thickness insulation 60 minutes; Came out of the stove in 1 minute fast in the insulation back; Use oil quenching, carry out 250-300 ℃ of tempering insulation thermal treatment in 8 hours after the quenching immediately and finish
Described quality inspection comprises metallographic structure inspection and the hardness test after physical dimension inspection, the thermal treatment.
2. the steel casting production technology of martensite wear-resistant steel according to claim 1 is characterized in that quantizing to learn composition by weight percentage is preferably: C:0.35%～0.45%, Si:0.8%～1.5%; Cr:2.1%～2.5%, Mn:0.8%～1.2%, Ni:0.7%～1.0%; Mo:0.6%～1.0%, Nb:0.1%～0.3%, Ti:0.1%～0.15%; Re:0.04%～0.05%, P, S≤0.04, surplus is an iron.
3. the steel casting production technology of martensite wear-resistant steel according to claim 1; It is characterized in that described smelting technology is for adopting the electric arc furnace smelting technology of adjustable integralization composition; Perhaps adopt the intermediate frequency furnace smelting technology; Must detect and calculate the alloy material add-on when adopting the intermediate frequency furnace smelting technology, Cr, Mn scaling loss are by 10% control, and the Ti yield calculates by 60%.
4. the steel casting production technology of martensite wear-resistant steel according to claim 1 is characterized in that described tapping temperature is controlled at 1550 ℃ to 1570 ℃, and the teeming temperature in the described pouring technology is controlled between 1440 ℃ to 1490 ℃.
5. the steel casting production technology of martensite wear-resistant steel according to claim 1 is characterized in that described casting technique uses phenolic sand molding, and Feeder Design adopts the natural air cooling for being prone to cut side riser.
6. the steel casting production technology of martensite wear-resistant steel according to claim 1; It is characterized in that whether the metallographic structure inspection after the described thermal treatment is that high dislocatrion martensite adds the retained austenite tissue for inspection metallographic structure lath martensite, hardness test: Rockwell hardness HRC50-55.
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Address after: 114051 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Patentee after: Anshan Iron and Steel Group Mining Co., Ltd. Address before: 114051 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Patentee before: Angang Group Mine Company |