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Extruding molding method of austenitic stainless steel seamless pipe for hydrogenation cracking furnace

An austenitic stainless steel and hydrocracking technology is applied in the field of extrusion forming of austenitic stainless steel seamless pipes for hydrocracking furnaces, and achieves the effects of not easy cracking, good thermoplasticity and high production efficiency

Active Publication Date: 2014-02-26
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above-mentioned shortcomings of the existing austenitic stainless steel seamless pipe forming methods for hydrocracking furnaces, the present invention provides an austenitic seamless pipe for hydrocracking furnaces that has good thermoplasticity during extrusion molding and is not prone to cracks during thermal processing. Extrusion forming method of body stainless steel seamless pipe

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The mass percent of the chemical composition of the austenitic stainless steel seamless pipe for hydrocracking furnace manufactured by the present embodiment is:

[0034] C 0.02 Si 0.45 Mn 1.20 P 0.012 S 0.002 Cr 16.50

[0035] Ni 11.20 Mo 2.10; the rest is Fe and unavoidable impurities.

[0036] Specification: Φ168×12mm

[0037] Dimensional tolerance requirements: outer diameter tolerance: ±3mm; wall thickness tolerance: ±3mm

[0038] Mechanical property requirements: yield strength R p0.2 ≥ 170MPa, tensile strength R m ≥485MPa, elongation A≥35%.

[0039] The inner and outer surfaces of the steel pipe shall not have cracks, folds, scabs, rolling folds and delamination defects.

[0040] This embodiment includes the following steps in sequence:

[0041] Ⅰ Tube blank preparation

[0042] Φ277mm forged tube blank is used, the diameter of the central through hole is Φ50mm; the length is 930mm.

[0043] Ⅱ Tube blank preheating

[0044] The tube blank enters t...

Embodiment 2

[0055] The mass percent of the chemical composition of the austenitic stainless steel seamless pipe for hydrocracking furnace manufactured by the present embodiment is:

[0056] C 0.018 Si 0.42 Mn 1.32 P 0.013 S 0.001 Cr 16.60 Ni 11.15 Mo 2.22; the rest is Fe and unavoidable impurities.

[0057] Specification: Φ325×20mm

[0058] Dimensional tolerance requirements: outer diameter tolerance: ±3mm; wall thickness tolerance: ±3mm

[0059] Mechanical property requirements: yield strength R p0.2 ≥170MPa, tensile strength R m ≥485MPa, elongation A≥35%.

[0060] The inner and outer surfaces of the steel pipe shall not have cracks, folds, scabs, rolling folds and delamination defects.

[0061] This embodiment includes the following steps in sequence:

[0062] Ⅰ Tube blank preparation

[0063] Φ432mm forged tube blank is used, the diameter of the central through hole is Φ80mm; the length is 900mm.

[0064] Ⅱ Tube blank preheating

[0065] The tube blank enters the ring fu...

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Abstract

The invention relates to an extruding molding method of an austenitic stainless steel seamless pipe for a hydrogenation cracking furnace. The method comprises the following steps of I, preparing a pipe blank, wherein the specification of the pipe blank is phi250mm to 450mm, and a central through hole is phi40mm to 100mm; II, preheating the pipe blank, wherein the temperature of the furnace when the pipe blank enters a furnace mouth is 750 DEG C plus or minus 10 DEG C, the target temperature of an annular furnace is 1000 DEG C plus or minus 10 DEG C, a heat homogenizing time lasts for 25min to 30min, the surface temperature of the pipe blank when the pipe blank is discharged from the furnace is 1000 DEG C plus or minus 10 DEG C; III, primarily heating in an induction manner, wherein the target induction temperature is 1150 DEG C plus or minus 10 DEG C, and the total time of the heating and heat preserving lasts for 3min to 5min; IV, broaching, namely, placing the pipe blank after being lubricated by glass powder into a broaching machine, and completing the broaching by utilizing a broaching cone; V, secondarily heating in the induction manner, wherein the pipe blank enters a second induction furnace, the target temperature is 1200 DEG C plus or minus 10 DEG C, and heat homogenizing time lasts for 1min to 2min; VI, extruding, namely, preheating an extrusion tube to be more than 300 DEG C, placing the pipe blank into an extruder after being lubricated by the glass powder, and performing water cooling on the pipe blank after the extrusion is completed. By adopting the extruding molding method of the stainless steel pipe, the thermoplasticity is good in molding, and a crack hard to occur in the heating machining process.

Description

technical field [0001] The invention relates to an extrusion molding method for austenitic stainless steel seamless pipes for hydrocracking furnaces. Specifically, the invention relates to an austenitic austenitic pipe for hydrocracking furnaces with an outer diameter of Φ168 mm to Φ325 mm and a wall thickness of not less than 12 mm. Extrusion forming method of stainless steel seamless pipe. Background technique [0002] With the rapid development of China's petrochemical industry, the capacity of hydrocracking units is constantly increasing. However, due to the increasing content of impurities in crude oil, the corrosion of hydrogen and hydrogen sulfide is becoming more and more serious, and the operating temperature of the furnace tube of the hydrogenation unit is high, and the working conditions of the furnace tube are becoming more and more severe, which requires the furnace tube to have high High temperature strength and excellent corrosion resistance. Austenitic stai...

Claims

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Application Information

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IPC IPC(8): B21C37/06B21C37/30
Inventor 赵振铎聂飞康喜唐范光伟
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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