Process for preparing hot-pressing low-temperature three-way fittings by using X70 steel plates

A steel plate and tee technology, which is applied in the technical field of using X70 steel plate to make hot-pressed low-temperature tees, can solve problems such as lack of mature process experience, and achieve the effects of reducing welding current, increasing welding speed, and good metallographic structure

Pending Publication Date: 2020-05-08
河北恒通管件集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The X80 steel grade D1422 pipe fittings resistant to -45℃ low temperature environment are in the stage of small batch trial production in several domestic key pipe fitting factories. Internal companies are also in the stage of technology research and development, and currently do not have mature process experience

Method used

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  • Process for preparing hot-pressing low-temperature three-way fittings by using X70 steel plates
  • Process for preparing hot-pressing low-temperature three-way fittings by using X70 steel plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A process for making hot-pressed low-temperature tee with X70 steel plate comprises the following steps:

[0027] Step 1, select a low carbon X70 steel plate with a thickness of 47mm, the metallographic structure of the X70 steel plate is F+B, the grain size is ≥ 10, and the following weight percentage elements in the X70 steel plate:

[0028] CEpcm0.18﹪, C 0.05﹪, Mn 1.49﹪, Si 0.29﹪, Cr 0.10﹪, Mo 0.11﹪, V0.015﹪, Ni 0.20﹪, Nb 0.045﹪, Cu 0.04﹪, the rest are Fe and inevitable impurities , the non-metallic inclusions in the impurities are less than or equal to grade 1.5;

[0029] Step 2, roll down, and cut the X70 steel plate into rectangular blanks;

[0030] Step 3, reel, the rectangular blank is rolled into a cylindrical blank tube;

[0031] Step 4: Welding, using an electrode to weld the longitudinal seam of the cylindrical blank tube. The welding electrode used for welding matches the strength of the base metal and is suitable for the reheating process. Interpass tem...

Embodiment 2

[0036] A process for making hot-pressed low-temperature tee with X70 steel plate comprises the following steps:

[0037] Step 1, select a low carbon X70 steel plate with a thickness of 47mm, the metallographic structure of the X70 steel plate is F+B, the grain size is ≥ 10, and the following weight percentage elements in the X70 steel plate: CEpcm0.18%, C0 .05﹪, Mn 1.49﹪, Si0.29﹪, Cr 0.10﹪, Mo 0.11﹪, V0.015﹪, Ni 0.20﹪, Nb 0.045﹪, Cu 0.04﹪, the rest are Fe and inevitable impurities, the impurities Medium and non-metallic inclusions ≤ grade 1.5;

[0038] Step 2, roll down, and cut the X70 steel plate into rectangular blanks;

[0039] Step 3, reel, the rectangular blank is rolled into a cylindrical blank tube;

[0040] Step 4: Welding, using an electrode to weld the longitudinal seam of the cylindrical blank tube. The welding electrode used for welding matches the strength of the base metal and is suitable for the reheating process. Interpass temperature≤200℃, welding current≤...

Embodiment 3

[0045] A process for making hot-pressed low-temperature tee with X70 steel plate comprises the following steps:

[0046] Step 1. Select a low carbon X70 steel plate with a thickness of 47mm, the metallographic structure of the X70 steel plate is F+B, the grain size is ≥ 10, and the following weight percentage elements in the X70 steel plate: CEpcm0.18%, C 0.05﹪, Mn 1.49﹪, Si0.29﹪, Cr 0.10﹪, Mo 0.11﹪, V0.015﹪, Ni 0.20﹪, Nb 0.045﹪, Cu 0.04﹪, the rest are Fe and inevitable impurities, among the impurities Non-metallic inclusions ≤ class 1.5;

[0047] Step 2, roll down, and cut the X70 steel plate into rectangular blanks;

[0048] Step 3, reel, the rectangular blank is rolled into a cylindrical blank tube;

[0049] Step 4: Welding, using an electrode to weld the longitudinal seam of the cylindrical blank tube. The welding electrode used for welding matches the strength of the base metal and is suitable for the reheating process. Interpass temperature≤200℃, welding current≤180A, w...

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Abstract

The invention discloses a process for preparing hot-pressing low-temperature three-way fittings by using X70 steel plates. In the process, firstly, a suitable base material with high manufacturing performance is selected; and meanwhile, on the premise that the welding metal is sufficiently fused in the welding process, the welding current is further reduced, so that the welding speed is improved,the heat input amount is limited, and blank pipes with consistent performance is provided for finished products. According to the process, all the machining procedures for heat input to the products are strictly controlled, and the metal crystal structure reflects the main index of the performance of steel and the main index of the performance of the steel is effectively controlled, the rolling quantity of each time and the water quenching treatment after rolling are strictly controlled, the good metallographic organization of the products is ensured all the time, and the products meeting therequirements of the low-temperature environment standards is finally obtained.

Description

technical field [0001] The invention relates to the technical field of processing tee pipe fittings, in particular to a process for making hot-pressed low-temperature tee by using X70 steel plate. Background technique [0002] At present, the minimum temperature of low-temperature environment pipelines and pipe fittings on the station site of high-grade steel-grade large-diameter gas pipelines built in China is designed to be -30 °C, and some pipelines below this temperature have adopted thermal insulation and heat tracing measures. X80 steel grade D1422 pipe fittings resistant to -45℃ low temperature environment are in the stage of small batch trial production in several key pipe fitting factories in China. Internal enterprises are also in the stage of technology research and development, and none of them have mature process experience at present. SUMMARY OF THE INVENTION [0003] Based on the above problems, the purpose of the present invention is to provide a process f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C21D1/18C21D6/00C21D9/08C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48
CPCB23P15/00C21D1/18C21D6/004C21D6/005C21D6/008C21D9/085C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48
Inventor 韩连新
Owner 河北恒通管件集团有限公司
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