Method for manufacturing wear-resistant steel pipe by using hot-rolling coiled plate

A wear-resistant steel pipe and hot-rolled coil technology, applied in the field of metallurgical manufacturing, can solve the problems of high energy consumption, long manufacturing cycle, low qualification rate, etc.

Active Publication Date: 2009-12-16
武汉钢实机电设备有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional manufacturing method of wear-resistant steel pipe is to use continuous casting or die casting billet, and then the billet is opened into a round billet by a section steel rolling mill, and then processed by heating, centering, piercing, rolling, sizing, reducing, heat treatment, quenching and tempering, etc. Manufacturing, the disadvantages of the wear-resistant steel pipe manufactured by this method are: the heat treatment is heated by a traditional heating furnace, the oxidation burning loss is large, the thermal efficiency is low, the energy consumption is large, the manufacturing cycle is long, the equipment investment is high, the yield is low, the process is complicated, and the steel pipe wall thickness Disadvantages such as unevenness, low pass rate, high manufacturing cost, and inability to manufacture large-diameter and thin-walled wear-resistant steel pipes

Method used

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  • Method for manufacturing wear-resistant steel pipe by using hot-rolling coiled plate
  • Method for manufacturing wear-resistant steel pipe by using hot-rolling coiled plate
  • Method for manufacturing wear-resistant steel pipe by using hot-rolling coiled plate

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Effect test

Embodiment 1

[0066]According to the present invention, the mass percentages of the chemical elements are: C: 0.15%, Si: 0.20%, Mn: 1.45%, Ni: 0.16%, Cr: 0.18%, Mo: 0.16%, Cu: 0.25%, Nb: 0.010% , V: 0.005%, Ti: 0.019%, Al: 0.034%, B: 0.0013%, P: 0.012%, S: 0.003%, N: 0.0042%, and the rest is iron wear-resistant steel pipe, the heat treatment method described The steps are: use ERW steel pipe unit to manufacture ERW steel pipe, use induction heating equipment to inductively heat the ERW steel pipe, and then heat the ERW steel pipe to 930°C within 100s; then quench with water at a cooling rate of 22°C / s, and quench The latter ERW steel pipe is heated to 260°C with induction heating equipment, and the tempering time is 120s to obtain a wear-resistant steel pipe with mechanical properties: HBW400.

[0067] figure 1 Shows the TTT curve diagram of the HBW400 wear-resistant steel pipe made of hot-rolled coils using the Formantor-F thermal dilatometer, combined with the observation of the metallograp...

Embodiment 2

[0069] When the mass percentage of each chemical element in the manufacturing is: C: 0.10-0.18%, Si: 0.15-0.50%, Mn: 0.70-1.40%, Ni: 0.01-0.20%, Cr: 0.10-0.30%, Mo: 0.10-0.55% , Cu: 0-0.20%, Nb: 0-0.035%, V: 0-0.035%, Ti: 0-0.020%, Al: 0.010-0.060%, B: 0.0005-0.0040%, Zr: 0-0.0005, P When <0.020%, S<0.010%, N<0.0080%, and the rest is iron wear-resistant steel pipe, the heat treatment method steps are: heating to 930-960℃ in induction heating equipment for austenitizing, and the heating time is 60-140s, heating and quenching cooling rate ≥10℃ / S, heating to 280-320℃ in induction heating equipment for tempering, tempering time 80-180s, to obtain tempered martensite structure. Then carry out straightening, flaw detection, surface inspection, sampling inspection, and obtain the wear-resistant steel pipe with mechanical properties: HBW360.

Embodiment 3

[0071] When the mass percentage of each chemical element in the manufacturing is: C: 0.10-0.18%, Si: 0.15-0.50%, Mn: 0.70-1.40%, Ni: 0.01-0.30%, Cr: 0.10-0.30%, Mo: 0.10-0.55% , Cu: 0-0.25%, Nb: 0-0.040%, V: 0-0.040%, Ti: 0-0.020%, Al: 0.010-0.075%, B: 0.0005-0.0040%, Zr: 0-0.0005%, When P<0.020%, S<0.010%, N<0.0080%, and the rest are iron wear-resistant steel pipes, the heat treatment method steps are: heating to 930℃-960℃ in induction heating equipment for austenitizing, heating The time is 60-140s, and then the ERW steel pipe is quenched in a water-cooled or aerosol-cooled quenching unit at a quenching cooling rate of ≥10℃ / S to obtain a steel pipe with a quenched martensitic structure, and then heated to 260℃ with induction heating equipment- Tempering at 300°C, the tempering time is 60-180s, the quenched martensite is transformed into tempered martensite, and then straightening, flaw detection, surface inspection, sampling inspection are performed to obtain a wear-resistant st...

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Abstract

The invention relates to a method for manufacturing a wear-resistant steel pipe by using a hot-rolling coiled plate, comprising a smelting method process, refining outside a furnace and steel blank manufacture. The method is characterized in that a steel blank is rolled and manufactured into a hot-rolling coiled plate blank material by using a hot continuous-rolling machine set or a furnace coiled rolling machine, the hot-rolling coiled plate blank material is rolled and welded into a pipe blank of an ERW steel pipe by using an ERW steel pipe machine set, and heat treatment is carried out after internal and external burrs are removed. The heat treatment method comprises the following steps that: (1) the pipe blank welded into the ERW steel pipe is heated in induction heating equipment to 910 to 960DEG C and austenized, the heating time is 60 to 140s, then the steel pipe with the austenitizing temperature is quenched in a water-cooling or steam-cooling quenching machine set, the quenching and cooling speed is greater than or equal to 10DEG C / S, the steel pipe with a quenched martensite organization is obtained, then induction tempering is carried out, the tempering temperature of the steel pipe is 210DEG C to 320DEG C, the tempering time is 60 to 180s, the quenched martensite is converted into a tempered martensite, and then straightening, flaw detection, surface inspection and sampling inspection are carried out to finally obtain the wear-resistant steel pipe with favorable wear resistance.

Description

Technical field [0001] The invention belongs to the technical field of metallurgical manufacturing, and particularly relates to a method for manufacturing wear-resistant steel pipes from hot rolled coils. Background technique [0002] The traditional method of manufacturing wear-resistant steel pipes is to use continuous casting or die-casting steel billets, which are billeted into round pipe billets through a section steel rolling mill, and are heated, centered, pierced, pipe rolled, sizing, reduced, heat treated and quenched and tempered. The shortcomings of the wear-resistant steel pipe manufactured by this method are: heat treatment adopts traditional heating furnace heating, large oxidation burn loss, low thermal efficiency, large energy consumption, long manufacturing cycle, high equipment investment, low yield rate, complex process, and thick steel pipe wall Disadvantages such as unevenness, low qualification rate, high manufacturing cost, and inability to manufacture larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/08C22C38/54C21D8/10C21D9/08C21D1/42C21D1/18C21D11/00
CPCY02P10/25
Inventor 马景怡
Owner 武汉钢实机电设备有限公司
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