CN101474646B - Hot extrusion technological process for elbow from X80 grade steel plate - Google Patents
Hot extrusion technological process for elbow from X80 grade steel plate Download PDFInfo
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- CN101474646B CN101474646B CN2009100677054A CN200910067705A CN101474646B CN 101474646 B CN101474646 B CN 101474646B CN 2009100677054 A CN2009100677054 A CN 2009100677054A CN 200910067705 A CN200910067705 A CN 200910067705A CN 101474646 B CN101474646 B CN 101474646B
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Abstract
The invention discloses a technical process of an X80 steel plate hot extrusion elbow. The technical process comprises the following steps: (1) designing chemical compositions of raw materials, selecting proper X80 steel plates, controlling the grain size of the X80 steel plates at above 11 grade to basically comply with requirements of API SPEC 5L standard; (2) blanking; (3) hot press moulding, controlling the heating temperature within 930 DEG C and the temperature of workblank in a furnace lower than 600 DEG C; (4) planing sheets; (5) spot welding and welding, selecting suitable current and voltage, controlling the interlayer temperature within 200 DEG C, the current between 160A and 190A and the voltage at 30V; (6) planing ends, trimming and detection; (7) hot treatment, putting welding seams at the same heated layer when a plurality of parts are simultaneously treated in a furnace; and (8) surface cleaning, end part processing and finished product detection. The technical processselects the raw materials with agreeable chemical compositions, reduces the current and the voltage, improves the welding speed and reduces the heat quantity during processing procedures, thus preventing the augmentation of grains and meeting the requirements of the X80 steel plate hot extrusion elbow.
Description
Affiliated technical field
The invention belongs to a kind of processing method of elbow, a kind of specifically process of X80 grade steel plate hot-pressed elbow.
Background technology
At present, on steel market, X70 level steel material is comparatively popularized and is widely used in the pipe fitting production.X80 level steel material still belongs to new material, and especially domestic application seldom.Because X80 level steel material than X70 level steel material intensity height, therefore, adopts X80 level steel tubing and pipe fitting in the petroleum gas conveying engineering, can improve the gas transmission ability, strengthen gas transmission process safe, stability.But, be impracticable if X80 level steel material adopts the technology of present X70 level steel material processing elbow fully, bigger change can take place in its structure, does not reach Q/SY GJX0130-2008 standard-required.
Summary of the invention
The present invention's purpose is to overcome the above-mentioned deficiency of prior art, and a kind of process of X80 grade steel plate hot extrude elbow is provided, and it can reach required standard, meets the demands.
For reaching above-mentioned purpose, the present invention takes following process:
1, the raw material chemical composition is designed, select suitable X80 grade steel plate, its carbon equivalent ce pc≤0.23%, C content is controlled in 0.07～0.10%, Mn content is 1.5～1.8%, Si content is 0.20～0.25%, and Cr content is 0.13%, and Mo content is 0.25%, V content is 0.035%, Ni content is 0.04%, and Nb content is 0.06%, and Cu content is 0.15%; Its grain size be controlled at 11 grades and more than;
2, blanking;
3, hot-forming, heating-up temperature can not surpass 930 ℃, and the blank charging temperature is below 600 ℃;
4, plain film;
5, suitable welding rod is selected in spot welding, welding, and the chemical composition of welding rod and mechanical property and mother metal are quite or higher slightly; Determine the mother metal heating-up temperature through simulated test, select suitable electric current, voltage, interlayer temperature is no more than 200 ℃, and electric current is between 160A～190A, and voltage is 30V, speed of welding 15～18cm/ branch;
6, Ping Kou, integer, detection;
7, heat treatment is controlled its putting position when handling with stove, weld seam is in the same thermosphere that is subjected to for many;
8, removing surface, end processing, finished product detection.
The present invention takes above-mentioned process, have following beneficial effect: the present invention selects the suitable raw material of chemical composition very crucial, the content of control carbon equivalent and carbon, clear and definite other component contents, make it meet API SPEC 5L standard code substantially, satisfy processing request, to improve its impact flexibility.Its grain size of the steel plate condition of delivery be controlled at 11 grades and more than, to adapt to repeatedly hot worked requirement.Another key point of the present invention is exactly the composition that takes into full account the materials chemistry composition, because the reduction of C content causes the reduction of phase transition temperature, therefore will control heating-up temperature in process, prevents the change of metallographic structure.Based on this guiding theory, under the prerequisite that welding rod can melt, reduce electric current, voltage as far as possible, thereby reduce heat.And control blank charging temperature, especially pipe fitting bulk temperature prevent the increase of crystal grain below lower change point.When heat treatment, formulate and the strict Technology for Heating Processing of implementing.Control its putting position, especially weld stress when handling for many and ask and be in the same thermosphere that is subjected to, it is heated evenly with stove.
The specific embodiment
Introduce the present invention in detail below in conjunction with embodiment.
Embodiment: the present invention takes following technology:
1, the raw material chemical composition is designed, select suitable X80 grade steel plate, its carbon equivalent ce pc≤0.23%, C content is controlled in 0.07～0.10%, Mn content is 1.5～1.8%, Si content is 0.20～0.25%, and Cr content is 0.13%, and Mo content is 0.25%, V content is 0.035%, Ni content is 0.04%, and Nb content is 0.06%, and Cu content is 0.15%; Its grain size be controlled at 11 grades and more than;
2, blanking;
3, hot-forming: heating-up temperature can not surpass 930 ℃, and the blank charging temperature is below 600 ℃;
4, plain film;
5, suitable welding rod is selected in spot welding, welding, and the chemical composition of welding rod and mechanical property and mother metal are quite or higher slightly; Determine the mother metal heating-up temperature through simulated test, select suitable electric current, voltage, interlayer temperature is no more than 200 ℃, and electric current is between 160A～190A, and voltage is 30V, and speed of welding is controlled at 15～18cm/ branch;
6, Ping Kou, integer, detection;
7, heat treatment is controlled its putting position when handling with stove, weld seam is in the same thermosphere that is subjected to for many;
8, removing surface, end processing, finished product detection.
In technology of the present invention, suitably improve firing rate, reduce and add up heat time heating time, increase single pipe fitting deflection, reduce the heating number of times.Be also noted that the entry position and the speed of pipe fitting, should note the temperature of summer in winter water (medium) simultaneously, and do corresponding the adjustment, to adapt to the requirement of its cooling velocity.
Claims (1)
1. X80 grade steel plate hot extrusion technological process for elbow is characterized in that this process is:
1) the raw material chemical composition is designed, select suitable X80 grade steel plate, its carbon equivalent ce pc≤0.23%, C content is controlled at 0.07～0.10%, Mn content is 1.5～1.8%, Si content is 0.20～0.25%, and Cr content is 0.13%, and Mo content is 0.25%, V content is 0.035%, Ni content is 0.04%, and Nb content is 0.06%, and Cu content is 0.15%; Its grain size be controlled at 11 grades and more than;
2) blanking;
3) hot-forming, heating-up temperature can not surpass 930 ℃, and the blank charging temperature is below 600 ℃;
4) plain film;
5) suitable welding rod is selected in spot welding, welding, and the chemical composition of welding rod and mechanical property and mother metal are suitable; Determine the mother metal heating-up temperature through simulated test, select suitable electric current, voltage, interlayer temperature is no more than 200 ℃, and electric current is between 160A～190A, and voltage is 30V, speed of welding 15～18cm/ branch;
6) flat mouth, integer, detection;
7) heat treatment is controlled its putting position when handling with stove, weld seam is in the same thermosphere that is subjected to for many;
8) removing surface, end processing, finished product detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100677054A CN101474646B (en) | 2009-01-15 | 2009-01-15 | Hot extrusion technological process for elbow from X80 grade steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100677054A CN101474646B (en) | 2009-01-15 | 2009-01-15 | Hot extrusion technological process for elbow from X80 grade steel plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101474646A CN101474646A (en) | 2009-07-08 |
| CN101474646B true CN101474646B (en) | 2010-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009100677054A Active CN101474646B (en) | 2009-01-15 | 2009-01-15 | Hot extrusion technological process for elbow from X80 grade steel plate |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102189377B (en) * | 2011-03-23 | 2013-01-30 | 河北宇鹏重工管道装备制造有限公司 | Manufacture process of X100 steel-grade steel plate hot-press bend |
| CN102950420A (en) * | 2011-08-17 | 2013-03-06 | 东台市远洋不锈钢制造有限公司 | Large-caliber stainless steel thin-wall bend process |
| CN105081005B (en) * | 2014-05-21 | 2017-03-01 | 河北宇鹏重工管道装备制造有限公司 | The manufacturing process of X80 steel-grade DN1400 heavy wall threeway |
| CN109161808A (en) * | 2018-10-30 | 2019-01-08 | 江苏亿超工程塑料有限公司 | A kind of Direct-Buried Heating Pipeline elbow and preparation method thereof |
| CN110842484A (en) * | 2019-11-28 | 2020-02-28 | 河北恒通管件集团有限公司 | Process for manufacturing hot-pressing low-temperature tee joint by utilizing X60 steel plate |
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2009
- 2009-01-15 CN CN2009100677054A patent/CN101474646B/en active Active
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| CN101474646A (en) | 2009-07-08 |
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Address after: 061300 Houhan Village, Hanji Town, Yanshan County, Cangzhou City, Hebei Province Patentee after: Hebei Hengtong Pipe Fittings Group Co., Ltd. Address before: 061303 Hengtong Pipe Fittings Manufacturing Co., Ltd. Cangzhou, Hanji Town, Yanshan County, Hebei Province Patentee before: Hebei Cangzhou Hengtong pipe fittings Manufacturing Co., Ltd. |