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Preparation of seamless special-shaped steel pipe for low temperature resistance oil derrick electric transmission pole tower

A technology for special-shaped steel pipes and seamless steel pipes, which is applied in furnace types, manufacturing tools, heat treatment equipment, etc., can solve problems such as poor comprehensive mechanical properties, high manufacturing costs, and poor welding process performance, achieve good comprehensive mechanical properties, and improve the overall Quality level, good welding manufacturability

Inactive Publication Date: 2008-09-10
江苏界达特异新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 2. Poor comprehensive mechanical properties
[0011] 3. The carbon equivalent is high, and the welding process performance is poor
[0016] 4. The manufacturing cost is high, and the price of chrome-molybdenum steel is relatively high

Method used

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  • Preparation of seamless special-shaped steel pipe for low temperature resistance oil derrick electric transmission pole tower
  • Preparation of seamless special-shaped steel pipe for low temperature resistance oil derrick electric transmission pole tower
  • Preparation of seamless special-shaped steel pipe for low temperature resistance oil derrick electric transmission pole tower

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Embodiment Construction

[0063] The invention relates to a method for manufacturing a seamless special-shaped steel pipe for a low-temperature-resistant oil derrick power transmission tower.

[0064] The percentage by weight of each chemical element in the material of the integral seamless steel tube round tube is: C0.15-0.18%, Mn 1.4-1.6%, Si 0.2-0.5%, and trace elements V 0.02-0.06%, Nb0.015-0.06 , Ti 0.02-0.06% and Al 0.02-0.05%, the balance is Fe and unavoidable impurities S≤0.020%, P≤0.020%, N≤0.020%, the specific process steps are as follows:

[0065] Step 1, annealing heat treatment

[0066] Annealing heat treatment hot-rolled steel tube billet, annealing temperature 850 ~ 880 ℃, holding time 30 minutes, air cooling,

[0067] Due to the inhomogeneity of hot rolling and cooling, the hot-rolled steel billet has a general hot-rolled bad structure and high hardness. After annealing heat treatment, the metallographic structure is refined, such as figure 1 . Improve the strength and plasticity to ...

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Abstract

The invention relates to a manufacturing method of a seamless special steel pipe used in a low temperature tolerant petroleum derrick power transmission tower and is made of integral seamless steel pipe round pipe billet by adopting annealing heat treatment, process of setting and cold drawing and process of heat treatment of products; wherein, weight ratios of each chemical element of materials are as follows: C accounts for 0.15 to 0.18 percent, Mn accounts for 1.4 to 1.6 percent, Si accounts for 0.2 to 0.5 percent and trace elements of V accounts for 0.02 to 0.06 percent, Nb accounts for 0.015 to 0.06 percent, Ti accounts for 0.02 to 0.06 percent and Al accounts for 0.02 to 0.05 percent and the left is Fe and unavoidable impurities. The specific processing steps are as follows: annealing heat treatment and air cooling with the temperature of 850 to 880 DEG C for 30 minutes; setting and cold drawing; the heat treatment of the products adopts quenching, injection water cooling and tempering and hardening heat treatment process with the quenching temperature of 900 to 930 DEG C for 20 to 30 minutes, and air cooling is adopted after the fast injection water cooling is done under 300 DEG C with the tempering temperature of 550 DEG C for 100 minutes. The seamless special shaped steel pipe prepared by the method is characterized by good low temperature performance, high strength and comprehensive mechanical properties and lower cost, etc.

Description

technical field [0001] The invention relates to a seamless special-shaped steel pipe, in particular to a method for preparing a seamless special-shaped steel pipe for a low-temperature-resistant oil derrick power transmission tower. Used in oil derricks, transmission towers, etc. The invention belongs to the technical field of metal material processing and heat treatment technology. Background technique [0002] Oil derricks and transmission towers belong to the energy and power industry. They should have excellent low-temperature performance and comprehensive mechanical properties when working under various harsh natural conditions in alpine regions. Table 1 and Table 2 show the chemical composition and comprehensive mechanical properties of metal materials used in oil derricks and power transmission towers in the past. [0003] Table 1. Chemical composition of materials used in the past for oil derricks and power transmission towers [0004] [0005] [0006] Tabl...

Claims

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Application Information

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IPC IPC(8): B23P17/00B21C1/24C22C38/14C21D9/08C21D1/26C23G1/08C21D1/18
Inventor 薛建良邓尔康
Owner 江苏界达特异新材料股份有限公司
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