CN103436806A - Production method of forged flange capable of meeting A694F70 high yield value core sampling requirements - Google Patents
Production method of forged flange capable of meeting A694F70 high yield value core sampling requirements Download PDFInfo
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- CN103436806A CN103436806A CN2013103163256A CN201310316325A CN103436806A CN 103436806 A CN103436806 A CN 103436806A CN 2013103163256 A CN2013103163256 A CN 2013103163256A CN 201310316325 A CN201310316325 A CN 201310316325A CN 103436806 A CN103436806 A CN 103436806A
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Abstract
The invention provides a production method of a forged flange capable of meeting A694F70 high yield value core sampling requirements. The production method comprises following steps: firstly, a round steel billet with specific quality is selected, is heated to an initial forging temperature, and is forged after heat preservation processing, wherein the temperature of the forging process is kept between the initial forging temperature and a final forging temperature; the flange obtained after forging is provided with prebored bolt holes, and then is subjected to normalizing, quenching and tempering processes; and finally, the A694F70 forge piece is sampled. The production method is capable of overcoming deficiencies of existing technologies; meeting the A694F70 core sampling requirements; improving the strength, toughness and heat treatment effects of the forage piece substantially; increasing the utilization ratio of materials greatly; improving the whole performance of the flange; and reducing production cost significantly.
Description
Technical field
The present invention relates to the production method of the high yield value core sampling of a kind of A694F70 flange forge piece, belong to flange forge piece production method technical field.
Background technology
At present, the A694F70 material is a kind of low-alloy high-strength carbon steel forging, is widely used in petroleum natural gas pipeline pipe fitting and flange.According to ASTM A694 standard-required, only need to meet the demands and get final product in the sampling of flange extension; On the problem that relates to the core sampling, this area research is few.
Traditional flange is lower at hub and terminal pad position intensity, and safety performance is poor.Propose to improve by the method for increase taper connection section between hub and ring flange the intensity of connecting portion in Chinese patent 201220166100 " with the hubbed flange of taper connection section ", but it has changed the structure of flange, can't meet user's actual demand.
Summary of the invention
The technical problem to be solved in the present invention is to provide the production method of a kind of A694F70 of meeting core sampling requirement, material use efficiency is high and cost is low flange forge piece.
In order to solve the problems of the technologies described above, technical scheme of the present invention is to provide the production method of the high yield value core sampling of a kind of A694F70 flange forge piece, and it is characterized in that: the method is comprised of following 7 steps:
Step 1: choose the round steel blank, composition and the weight percent of round steel blank steel alloy used are: carbon≤0.26%, silicon≤0.4%, manganese≤1.4%, phosphorus≤0.025%, sulphur≤0.025%, chromium≤0.2%, molybdenum≤0.5%, nickel≤0.5%, copper≤0.5%, aluminium≤0.06%, niobium≤0.5%, surplus Fe >=95.63%.
Step 2: the round steel blank is heated to 1200 ℃ of initial forging temperatures, and insulation, forged blank, and final forging temperature is 800～900 ℃, and forging process must carry out in beginning, final forging temperature scope;
Step 3: preboring bolt hole on the ring flange after forging;
Step 4: normalizing process
Flange is heated to 920～960 ℃, insulation, then air cooling is to room temperature;
Step 5: quenching technology
Flange is heated to 930～960 ℃, and insulation, then insert quenching-in water by flange, until flange, takes out during at 200 ℃;
Step 6: tempering process
Flange is heated to 500～600 ℃, insulation, then air cooling is to room temperature;
Step 7: forging sampling
The A694F70 forging is sampled, and three directions are divided in sample position: tangential, radial and axial.
Preferably, in described step 2, the heat-processed temperature rise rate is 120～150 ℃/h.
Preferably, in described step 2, soaking time is 3～5 hours.
Preferably, in described step 2, the solid forging of forging process ratio is greater than 4.
Preferably, in described step 4, soaking time is 4～6 hours.
Preferably, in described step 5, soaking time is 3～4 hours.
Preferably, in described step 6, soaking time is 5～6 hours.
The production method of the high yield value core sampling of A694F70 provided by the invention flange forge piece is to increase the obdurability elements such as Cr, Mo, Ni, Cu, Nb on A694F70 forging basis, improves significantly intensity and the toughness of forging; Forging process is in the situation that conventional, and the increasing forging ratio, carry out forging molding by suitable frock, increases substantially the utilization ratio of material, improves the flange overall performance, reduces amount of finish, significantly reduces production costs; Adopt the preboring bolt hole, improve thermal effectiveness, improve the whole mechanical property of A694F70 forging; Forging adopts the core sampling, has obtained good effect.
Method provided by the invention has overcome the deficiencies in the prior art, meet A694F70 core sampling requirement, improved significantly intensity, toughness and the thermal effectiveness of forging, increased substantially the utilization ratio of material, improve the flange overall performance, significantly reduced production cost.
The accompanying drawing explanation
Fig. 1 is flange core sampling tangential direction and test sample position view radially;
Fig. 2 is that the flange core samples axial test sample position view;
Fig. 3 organizes photo after the tempering of neck core;
Fig. 4 is that T organizes photo after the core tempering.
Embodiment
For the present invention is become apparent, hereby with several preferred embodiments, and coordinate accompanying drawing to be described in detail below.
Embodiment 1
Step 1: for shaping prod better, according to the analysis to the product size cross section, choose φ 600mm round steel blank, cutting length is 300mm.
Composition and the weight percent of round steel blank steel alloy used are: carbon 0.16%, silicon 0.3%, manganese 1.3%, phosphorus 0.01%, sulphur 0.005%, chromium 0.12%, molybdenum 0.05%, nickel 0.14%, copper 0.3%, aluminium 0.01%, niobium 0.25%, surplus Fe97.36%.
Step 2: select the process furnace through the harmonious test passes of furnace temperature, by blank heating to initial forging temperature, initial forging temperature is 1200 ℃, after soaking time 3 hours, adopt 4T electricity liquid hammer to be forged, final forging temperature is 900 ℃, and forging process must carry out in beginning, final forging temperature scope, and solid forging is than 5.7.
Temperature rise rate is at 150 ℃/h, and tracking control of full process records heat-processed.
Step 3: preboring bolt hole
Preboring bolt hole on ring flange after forging, improve the subsequent heat treatment effect.
Step 4: normalizing process
After forging, at first carry out normalizing thermal treatment, the A694F70 flange is heated to 960 ℃, be incubated 4 hours, then air cooling is to room temperature.Main purpose is for eliminating segregation, crystal grain thinning.
Step 5: quenching technology
Flange is heated to 960 ℃, is incubated 3 hours, then flange is inserted to quenching-in water, take out during 200 ℃ of left and right until flange.
Step 6: tempering process
Flange is heated to 600 ℃, is incubated 5 hours, then air cooling is to room temperature.
The burning hot technique of quenching add-back is mainly to improve the comprehensive mechanical property of A694F70.
Step 7: forging sampling
After completing thermal treatment, the A694F70 forging is sampled, three directions are divided in sample position: tangential, radial and axial.As depicted in figs. 1 and 2, the T place means the tangential direction test sample; The R place means radially test sample; The X place means axial test sample.
The flange of making is tested, and data of mechanical is as shown in table 1, after its neck core tempering, organizes photo as shown in Figure 3, and its T organizes photo as shown in Figure 4 after the core tempering.
Table 1 embodiment 1 flange data of mechanical
Embodiment 2
Step 1: for shaping prod better, according to the analysis to the product size cross section, choose φ 550mm round steel blank, cutting length is 320mm.
Composition and the weight percent of round steel blank steel alloy used are: carbon 0.15%, silicon 0.28%, manganese 1.32%, phosphorus 0.011%, sulphur 0.006%, chromium 0.14%, molybdenum 0.046%, nickel 0.15%, copper 0.26%, aluminium 0.015%, niobium 0.26%, surplus Fe97.36%.
Step 2: select the process furnace through the harmonious test passes of furnace temperature, by blank heating to initial forging temperature, initial forging temperature is 1200 ℃, after soaking time 5 hours, adopt 4T electricity liquid hammer to be forged, final forging temperature is 800 ℃, and forging process must carry out in beginning, final forging temperature scope, and solid forging is than 6.2.
Temperature rise rate is at 120 ℃/h, and tracking control of full process records heat-processed.
Step 3: preboring bolt hole
Preboring bolt hole on ring flange after forging, improve the subsequent heat treatment effect.
Step 4: normalizing process
After forging, at first carry out normalizing thermal treatment, the A694F70 flange is heated to 920 ℃, be incubated 6 hours, then air cooling is to room temperature.Main purpose is for eliminating segregation, crystal grain thinning.
Step 5: quenching technology
Flange is heated to 930 ℃, is incubated 4 hours, then flange is inserted to quenching-in water, take out during 200 ℃ of left and right until flange.
Step 6: tempering process
Flange is heated to 500 ℃, is incubated 6 hours, then air cooling is to room temperature.
The burning hot technique of quenching add-back is mainly to improve the comprehensive mechanical property of A694F70.
Step 7: forging sampling
After completing thermal treatment, the A694F70 forging is sampled, three directions are divided in sample position: tangential, radial and axial.As depicted in figs. 1 and 2, the T place means the tangential direction test sample; The R place means radially test sample; The X place means axial test sample.
The flange of making is tested, and data of mechanical is as shown in table 2.
Table 2 embodiment 2 flange data of mechanical
Result by example 1 and example 2 can draw, the A694F70 flange core sampling the present invention relates to all can meet the demands.
The present invention is based on customer need, i.e. " the core sampling meets the mechanical property requirement of A694F70, meets welding property simultaneously and requires ", in the situation that do not change flange arrangement, redesigned the forging chemical composition, existing forging process and thermal treatment process have been optimized simultaneously.
Chemical composition involved in the present invention is to increase the obdurability elements such as Cr, Mo, Ni, Cu, Nb on A694F70 forging basis, improves significantly intensity and the toughness of forging; Forging process is in the situation that conventional, and the increasing forging ratio, carry out forging molding by suitable frock, increases substantially the utilization ratio of material, improves the flange overall performance, reduces amount of finish, significantly reduces production costs; Adopt the preboring bolt hole, improve thermal effectiveness, improve the whole mechanical property of A694F70 forging; Forging adopts the core sampling, has obtained good effect.
Claims (7)
1. the production method of the high yield value core sampling of A694F70 flange forge piece, it is characterized in that: the method is comprised of following 7 steps:
Step 1: choose the round steel blank, composition and the weight percent of round steel blank steel alloy used are: carbon≤0.26%, silicon≤0.4%, manganese≤1.4%, phosphorus≤0.025%, sulphur≤0.025%, chromium≤0.2%, molybdenum≤0.5%, nickel≤0.5%, copper≤0.5%, aluminium≤0.06%, niobium≤0.5%, surplus Fe >=95.63%.
Step 2: the round steel blank is heated to 1200 ℃ of initial forging temperatures, and insulation, forged blank, and final forging temperature is 800～900 ℃, and forging process must carry out in beginning, final forging temperature scope;
Step 3: preboring bolt hole on the ring flange after forging;
Step 4: normalizing process
Flange is heated to 920～960 ℃, insulation, then air cooling is to room temperature;
Step 5: quenching technology
Flange is heated to 930～960 ℃, and insulation, then insert quenching-in water by flange, until flange, takes out during at 200 ℃;
Step 6: tempering process
Flange is heated to 500～600 ℃, insulation, then air cooling is to room temperature;
Step 7: forging sampling
The A694F70 forging is sampled, and three directions are divided in sample position: tangential, radial and axial.
2. the high yield value core of a kind of A694F70 as claimed in claim 1 samples the production method of flange forge piece, and it is characterized in that: in described step 2, the heat-processed temperature rise rate is 120～150 ℃/s.
3. the high yield value core of a kind of A694F70 as claimed in claim 1 samples the production method of flange forge piece, and it is characterized in that: in described step 2, soaking time is 3～5 hours.
4. the high yield value core of a kind of A694F70 as claimed in claim 1 samples the production method of flange forge piece, and it is characterized in that: in described step 2, the solid forging of forging process ratio is greater than 4.
5. the high yield value core of a kind of A694F70 as claimed in claim 1 samples the production method of flange forge piece, and it is characterized in that: in described step 4, soaking time is 4～6 hours.
6. the high yield value core of a kind of A694F70 as claimed in claim 1 samples the production method of flange forge piece, and it is characterized in that: in described step 5, soaking time is 3～4 hours.
7. the high yield value core of a kind of A694F70 as claimed in claim 1 samples the production method of flange forge piece, and it is characterized in that: in described step 6, soaking time is 5～6 hours.
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Cited By (4)
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|---|---|---|---|---|
| CN104962705A (en) * | 2015-07-29 | 2015-10-07 | 山东伊莱特重工有限公司 | Isothermal normalizing treatment technique of wind power flange |
| CN105925904A (en) * | 2016-06-23 | 2016-09-07 | 江阴兴澄特种钢铁有限公司 | Mo-containing steel plate being high in high-temperature strength and good in low-temperature impact toughness, and manufacturing method thereof |
| CN107310192A (en) * | 2017-08-30 | 2017-11-03 | 南通润德机械科技有限公司 | A kind of novel hydraulic machine guide pillar |
| CN114318162A (en) * | 2021-12-27 | 2022-04-12 | 中航卓越锻造（无锡）有限公司 | Flange forging for high-impact-performance water turbine and manufacturing method thereof |
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| CN102605272A (en) * | 2012-03-31 | 2012-07-25 | 三一集团有限公司 | Low-alloy ultrahigh-strength wear-resistant steel and production method thereof |
| CN102605271A (en) * | 2012-03-31 | 2012-07-25 | 三一集团有限公司 | Low-alloy high-intensity high-toughness steel and production method of low-alloy high-intensity high-toughness steel |
| CN102191442B (en) * | 2011-05-13 | 2012-10-10 | 宝鸡石油机械有限责任公司 | Steel for marine riser flange of marine deepwater drilling and manufacturing method of marine riser flange |
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| US6699333B1 (en) * | 1998-06-29 | 2004-03-02 | Aubert & Duval | Case hardened steel with high tempering temperature, method for obtaining same and parts formed with said steel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104962705A (en) * | 2015-07-29 | 2015-10-07 | 山东伊莱特重工有限公司 | Isothermal normalizing treatment technique of wind power flange |
| CN105925904A (en) * | 2016-06-23 | 2016-09-07 | 江阴兴澄特种钢铁有限公司 | Mo-containing steel plate being high in high-temperature strength and good in low-temperature impact toughness, and manufacturing method thereof |
| CN105925904B (en) * | 2016-06-23 | 2017-11-21 | 江阴兴澄特种钢铁有限公司 | The excellent steel plate containing Mo of a kind of high-temp and high-strength, low-temperature impact toughness and its manufacture method |
| CN107310192A (en) * | 2017-08-30 | 2017-11-03 | 南通润德机械科技有限公司 | A kind of novel hydraulic machine guide pillar |
| CN114318162A (en) * | 2021-12-27 | 2022-04-12 | 中航卓越锻造（无锡）有限公司 | Flange forging for high-impact-performance water turbine and manufacturing method thereof |
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Inventor after: Zhao Rucheng Inventor after: Ying Daoyan Inventor after: Sun Youlian Inventor after: Zhang Zheng Inventor after: Xie Jianchang Inventor after: Ren Liping Inventor after: Luo Weisong Inventor after: Chen Xin Inventor after: Rao Kai Inventor before: Xie Jianchang Inventor before: Rao Jianhong Inventor before: Zhang Zheng |
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Free format text: CORRECT: INVENTOR; FROM: XIE JIANCHANG RAO JIANHONG ZHANG ZHENG TO: ZHAO RUCHENG YING DAOYAN SUN YOULIAN ZHANG ZHENG XIE JIANCHANG REN LIPING LUO WEISONG CHEN XIN RAO KAI |
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Application publication date: 20131211 |