CN102732701A - Method for carrying out quenching on bimetal tube with outer low-carbon steel layer and inner high-carbon-chromium bearing steel layer - Google Patents
Method for carrying out quenching on bimetal tube with outer low-carbon steel layer and inner high-carbon-chromium bearing steel layer Download PDFInfo
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Abstract
The invention discloses a method for carrying out quenching on a bimetal tube with an outer low-carbon steel layer and an inner high-carbon-chromium bearing steel layer, which relates to the technical field of heat treatment on iron-base alloys. The method comprises the following steps of: 1, heating the bimetal tube in a quenching furnace to 835-855 DEG C, and carrying out heat preservation on the bimetal tube for 15-40 min so as to complete an austenitizing process of a structure; 2, after the heat preservation is completed, immediately taking the bimetal tube out of the quenching furnace, quickly conveying the bimetal tube to a pool filled with water, cooling the bimetal tube for 4-6 seconds, immediately taking the bimetal tube out of the water surface, 3-4 seconds later, quenching the bimetal tube into the water, cooling the bimetal tube for 2-4 seconds, then taking the bimetal tube out of the water surface again, and cooling the bimetal tube in the air. According to the method, water is taken as a quenching medium for carrying out intermittent quenching, and the hardness value of the inner high-carbon-chromium bearing steel layer can reach more than 60 HRC, thereby not only achieving an effect of good hardenability, but also avoiding the occurrence of quenching cracks caused by the factor that the bimetal tube is directly cooled to room temperature in water.
Description
Technical field
The present invention relates to the heat treatment technics field of ferrous alloy, relate in particular to a kind of quenching method of outer soft steel internal layer high-carbon-chromium bearing steel bimetal tube.
Background technology
The working conditions of outer soft steel internal layer high-carbon-chromium bearing steel bimetal tube: inner layer metal has higher hardness, wear resistance, and outer layer metal has certain toughness, intensity.At present, outer soft steel internal layer high-carbon-chromium bearing steel bimetal tube is heated to 830 ℃-850 ℃, insulation 15-40min; Put into oil then fast and cool off, impel austenite to martensitic transformation, this mode can realize the good through hardening of inner layer metal; Hardness reaches more than the HRC60, simultaneously, and when tube temperature is 200-300 ℃; The speed of cooling of oil reduces, and has reduced thermal stress, structural stress when martensite forms, has avoided the quenching crack of internal layer high-carbon-chromium bearing steel.Can avoid the quenching crack of tube wall through the mode of oil quenching, realize high wear resistance simultaneously.But the bimetal tube oil quenching not only needs oil groove, and oil burning easily, and security is relatively poor; Also need corresponding cooling, simultaneously, oil is prone to aging, has increased the more cost of renew oil; And the back steel pipe that quenches is difficult for cleaning, and has increased matting, and the cost that causes oil quenching is than higher.
Summary of the invention
Technical problem to be solved by this invention provides a kind of quenching method of outer soft steel internal layer high-carbon-chromium bearing steel bimetal tube, can overcome in traditional oil quenching method oil burning easily, be prone to the shortcoming that aging, bimetal tube is difficult for cleaning, cost is high.
For solving the problems of the technologies described above, the technical scheme that the present invention taked is: a kind of quenching method of outer soft steel internal layer high-carbon-chromium bearing steel bimetal tube is characterized in that may further comprise the steps:
Step 1: said bimetal tube is heated to 835-855 ℃ in quenching furnance, insulation 15-40min accomplishes the austenitization of organizing;
Step 2: after the insulation, come out of the stove at once, rapidly said bimetal tube is transported in the pond of filling water, behind the cooling 4-6s, leave the water at once, behind the 3-4s that waits, in the entry of quenching again, cooling 2-4s leaves the water once more, in air, cools off.
Further scheme of the present invention is: the material of said bimetal tube is: outer 10# internal layer GCr15, outer 20# internal layer GCr15, outer 10MnV internal layer GCr15, outer 14MnV internal layer GCr15, outer 16Mn internal layer GCr15SiMn, outer 20Mn internal layer GCr15SiMn and outer 16Mn internal layer GCr15SiMo; Outside diameter D between φ 89～φ 219mm, total wall thickness δ
1Between 5～9mm, outer wall thickness δ
2Between 2～4mm, total length L is between 3～9m.
Further scheme of the present invention is: said bimetal tube is a metallurgical binding bimetal weldless steel tube.
Adopt the beneficial effect that technique scheme produced to be: said method has guaranteed internal layer high-carbon-chromium bearing steel speed of cooling faster; Thereby supercooled austenite is crossed least stable TR rapidly; Be cooled to the martensite transformation temperature interval, accomplish supercooled austenite to martensitic transformation, and reduced the speed of cooling in the martensitic transformation process; Reduce thermal stresses, structural stress when martensite forms, avoided the quenching crack of internal layer high-carbon-chromium bearing steel.Make water as quenchant, carry out interrupted hardening, the hardness value of internal layer high-carbon-chromium bearing steel can reach more than the 60HRC; Not only realized good hardening capacity, and avoided the bimetal tube quenching crack that directly cool to room temperature causes in water, the water price lattice are cheap; Easy to operate, safe, substitute oil as quenchant; Remove the matting of bimetal tube from, reduced production cost, improved production efficiency.
Embodiment
A kind of quenching method of outer soft steel internal layer high-carbon-chromium bearing steel bimetal tube may further comprise the steps: step 1, said bimetal tube is heated to 835-855 ℃ in quenching furnance, and insulation 15-40min accomplishes the austenitization of organizing; Step 2 after the insulation, is come out of the stove at once, rapidly said bimetal tube is transported in the pond of filling water, behind the cooling 4-6s, leaves the water at once, and behind the 3-4s that waits, in the entry of quenching again, cooling 2-4s leaves the water once more, in air, cools off.
The material of said bimetal tube can be outer 10# internal layer GCr15, outer 20# internal layer GCr15, outer 10MnV internal layer GCr15, outer 14MnV internal layer GCr15, outer 16Mn internal layer GCr15SiMn, outer 20Mn internal layer GCr15SiMn and outer 16Mn internal layer GCr15SiMo; Outside diameter D between φ 89～φ 219mm, total wall thickness δ
1Between 5～9mm, outer wall thickness δ
2Between 2～4mm; Total length L is between 3～9m; Said bimetal tube is a metallurgical binding bimetal weldless steel tube; That is to say that said bimetal tube can adopt the casting of rotary casting moulding process to form, also can adopt multiunit tube hot extrusion molding cast to form, can also adopt other method casting to form.
Embodiment 1: said bimetal tube is the metallurgical binding bimetal tube, and material is 10#/GCr15, promptly outer 10# steel, and internal layer GCr15 steel, outside diameter φ are 170mm, tube wall total thickness=8mm, (outer wall thickness 3mm+ internal layer wall thickness 5mm).In quenching furnance, be heated to 835-855 ℃, insulation 20-40min is transported to bimetal tube in the pond of filling water rapidly, behind the cooling 5-6s, leaves the water at once, and behind the 3-4s that waits, in the entry of quenching again, cooling 3-4s leaves the water air cooling once more.The back tissue quenches: internal layer is tiny martensite+tiny carbide+residual austenite, and skin is mainly martensite.Hardness after quenching: internal layer HRC60-66, bimetal tube any surface finish, smooth, no quenching crack.
Embodiment 2: said bimetal tube is the metallurgical binding bimetal tube, and material is 20#/GCr15, promptly outer 20# steel, and internal layer GCr15 steel, outside diameter φ are 180mm, tube wall total thickness=6mm, (outer wall thickness 3mm+ internal layer wall thickness 3mm).In quenching furnance, be heated to 835-855 ℃, insulation 20-40min is transported to bimetal tube in the pond of filling water rapidly, behind the cooling 5-6s, leaves the water at once, and behind the 3-4s that waits, in the entry of quenching again, cooling 3-4s leaves the water air cooling once more.The back tissue quenches: internal layer is tiny martensite+tiny carbide+residual austenite, and skin is mainly martensite.Hardness after quenching: internal layer HRC60-66, bimetal tube any surface finish, smooth, no quenching crack.
Embodiment 3: said bimetal tube is the metallurgical binding bimetal tube, and material is 10MnV/GCr15, promptly outer 10MnV steel, and internal layer GCr15 steel, outside diameter φ are 160mm, tube wall total thickness=7mm, (outer wall thickness 3mm+ internal layer wall thickness 4mm).In quenching furnance, be heated to 835-855 ℃, insulation 20-40min is transported to bimetal tube in the pond of filling water rapidly, behind the cooling 5-6s, leaves the water at once, and behind the 3-4s that waits, in the entry of quenching again, cooling 3-4s leaves the water air cooling once more.The back tissue quenches: internal layer is tiny martensite+tiny carbide+residual austenite, and skin is mainly martensite.Hardness after quenching: internal layer HRC60-66, bimetal tube any surface finish, smooth, no quenching crack.
Embodiment 4: said bimetal tube is the metallurgical binding bimetal tube, and material is 14MnV/GCr15, promptly outer 14MnV steel, and internal layer GCr15 steel, outside diameter φ are 159mm, tube wall total thickness=8.5mm, (outer wall thickness 3mm+ internal layer wall thickness 5.5mm).In quenching furnance, be heated to 835-855 ℃, insulation 20-40min is transported to bimetal tube in the pond of filling water rapidly, behind the cooling 5-6s, leaves the water at once, and behind the 3-4s that waits, in the entry of quenching again, cooling 3-4s leaves the water air cooling once more.The back tissue quenches: internal layer is tiny martensite+tiny carbide+residual austenite, and skin is mainly martensite.Hardness after quenching: internal layer HRC60-66, bimetal tube any surface finish, smooth, no quenching crack.
Embodiment 5: said bimetal tube is the metallurgical binding bimetal tube; Material is 16Mn/GCr15SiMn, promptly outer 16Mn steel, internal layer GCr15SiMn steel; Product specification is 140mm for outside diameter φ, tube wall total thickness=9mm (outer wall thickness 3mm+ internal layer wall thickness 6mm).In quenching furnance, be heated to 835-855 ℃, insulation 20-40min is transported to bimetal tube in the pond of filling water rapidly, behind the cooling 5-6s, leaves the water at once, and behind the 3-4s that waits, in the entry of quenching again, cooling 3-4s leaves the water air cooling once more.The back tissue quenches: internal layer is tiny martensite+tiny carbide+residual austenite, and skin is mainly martensite.Hardness after quenching: internal layer HRC60-66, bimetal tube any surface finish, smooth, no quenching crack.
Embodiment 6: said bimetal tube is the metallurgical binding bimetal tube; Material is 20Mn/GCr15SiMn, promptly outer 20Mn steel, internal layer GCr15SiMn steel; Product specification is 133mm for outside diameter φ, tube wall total thickness=5.5m (outer wall thickness 2.5mm+ internal layer wall thickness 3mm).In quenching furnance, be heated to 835-855 ℃, insulation 15-30min is transported to bimetal tube in the pond of filling water rapidly, behind the cooling 4-5s, leaves the water at once, and behind the 3-4s that waits, in the entry of quenching again, cooling 2-4s leaves the water air cooling once more.The back tissue quenches: internal layer is tiny martensite+tiny carbide+residual austenite, and skin is mainly martensite.Hardness after quenching: internal layer HRC60-66, bimetal tube any surface finish, smooth, no quenching crack.
Embodiment 7: said bimetal tube is the metallurgical binding bimetal tube; Material is 16Mn/GCr15SiMo, promptly outer 16Mn steel, internal layer GCr15SiMo steel; Product specification is 133mm for outside diameter φ, tube wall total thickness=5.5m (outer wall thickness 2.5mm+ internal layer wall thickness 3mm).In quenching furnance, be heated to 835-855 ℃, insulation 15-30min is transported to bimetal tube in the pond of filling water rapidly, behind the cooling 4-5s, leaves the water at once, and behind the 3-4s that waits, in the entry of quenching again, cooling 2-4s leaves the water air cooling once more.The back tissue quenches: internal layer is tiny martensite+tiny carbide+residual austenite, and skin is mainly martensite.Hardness after quenching: internal layer HRC60-66, bimetal tube any surface finish, smooth, no quenching crack.
Said method has guaranteed internal layer high-carbon-chromium bearing steel speed of cooling faster; Thereby supercooled austenite is crossed least stable TR rapidly; Be cooled to the martensite transformation temperature interval, accomplish supercooled austenite to martensitic transformation, and reduced the speed of cooling in the martensitic transformation process; Reduce thermal stresses, structural stress when martensite forms, avoided the quenching crack of internal layer high-carbon-chromium bearing steel.Make water as quenchant, carry out interrupted hardening, the hardness value of internal layer high-carbon-chromium bearing steel reaches more than the 60HRC, has not only realized good hardening capacity, and has avoided the bimetal tube quenching crack that directly cool to room temperature causes in water.The water price lattice are cheap, and are easy to operate, safe, substitute oil as quenchant, removed the matting of bimetal tube from, reduced production cost.
Claims (3)
1. the quenching method of an outer soft steel internal layer high-carbon-chromium bearing steel bimetal tube is characterized in that may further comprise the steps:
Step 1: said bimetal tube is heated to 835-855 ℃ in quenching furnance, insulation 15-40min accomplishes the austenitization of organizing;
Step 2: after the insulation, come out of the stove at once, rapidly said bimetal tube is transported in the pond of filling water, behind the cooling 4-6s, leave the water at once, behind the 3-4s that waits, in the entry of quenching again, cooling 2-4s leaves the water once more, in air, cools off.
2. the quenching method of a kind of outer soft steel internal layer high-carbon-chromium bearing steel bimetal tube according to claim 1; The material that it is characterized in that said bimetal tube is: outer 10# internal layer GCr15, outer 20# internal layer GCr15, outer 10MnV internal layer GCr15, outer 14MnV internal layer GCr15, outer 16Mn internal layer GCr15SiMn, outer 20Mn internal layer GCr15SiMn and outer 16Mn internal layer GCr15SiMo; Outside diameter D between φ 89～φ 219mm, total wall thickness δ
1Between 5～9mm, outer wall thickness δ
2Between 2～4mm, total length L is between 3～9m.
3. the quenching method of a kind of outer soft steel internal layer high-carbon-chromium bearing steel bimetal tube according to claim 1 is characterized in that said bimetal tube is a metallurgical binding bimetal weldless steel tube.
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Cited By (1)
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| CN108709655A (en) * | 2018-07-27 | 2018-10-26 | 久茂自动化(大连)有限公司 | A kind of manufacturing method, protection pipe and the thermocouple of the protection pipe of thermocouple |
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Application publication date: 20121017 |