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Low temperature-resistant specially-shaped steel tube and preparation method thereof

A special-shaped steel pipe, low temperature resistance technology, applied in furnace types, manufacturing tools, heat treatment equipment, etc., can solve problems such as failure, low impact toughness, low stress brittleness, etc., and achieve simple production process, good weldability, and long fatigue life. Effect

Inactive Publication Date: 2014-10-01
张家港市华尊宝特种材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to overcome the technical deficiencies in the prior art that steel pipes have low impact toughness at low temperature and are prone to low stress brittle failure, and provide a low temperature resistant special-shaped steel pipe with high impact toughness at low temperature and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A low temperature resistant special-shaped steel pipe, the mass percentage of its chemical composition is: C0.06, Si0.2, Ni2.4,, Cr1.6, Mn1.1, Al0.5, Mo0.3, Nb0.12, Ti0. 06. Nd0.04, N0.005, Cu0.08, P0.008, S0.001, Ce0.0005, Pr0.01, the balance being Fe.

[0022] The method for preparing the above-mentioned low-temperature-resistant special-shaped steel pipe:

[0023] (1) Steel billet preparation: use high-quality scrap steel and iron as raw materials, use electric arc furnace for melting, and the melting temperature is 1580-1600°C. Slag agent 16kg / t, keep warm for 45-60min, remove slag, then adjust the temperature to 1660-1680°C, deoxidize for 20-30min, take samples and analyze and adjust the composition according to the chemical composition requirements, when the temperature of molten steel reaches 1680-1700°C, the steel is tapped, Add 1.2kg / t steel aluminum cake to the molten steel before tapping for final deoxidation; electromagnetic stirring and atomization cooling...

Embodiment 2

[0032] A low temperature resistant special-shaped steel pipe, the mass percentage of its chemical composition is: C0.18, Si0.4, Ni3.2, Cr2.2, Mn1.3, Al0.8, Mo0.6, Nb0.24, Ti0.14 , Nd0.07, N0.007, Cu0.18, P0.012, S0.004, Ce0.001, Pr0.02, and the balance is Fe.

[0033] The method for preparing the above-mentioned low-temperature-resistant special-shaped steel pipe:

[0034] (1) Steel billet preparation: use high-quality scrap steel and iron as raw materials, use electric arc furnace for melting, and the melting temperature is 1600-1620°C. Slag agent 17kg / t, keep warm for 45-60min, remove slag, then adjust the temperature to 1680-1700°C, deoxidize for 20-30min, sample and analyze and adjust the composition according to the chemical composition requirements, when the temperature of molten steel reaches 1680-1700°C, the steel is tapped, Add 1.3kg / t steel aluminum cake to the molten steel before tapping for final deoxidation; electromagnetic stirring and atomization cooling are pe...

Embodiment 3

[0043] A low-temperature-resistant special-shaped steel pipe, the mass percentage of its chemical composition is: C0.12, Si0.3, Ni2.8, Cr1.8, Mn1.2, Al0.6, Mo0.4, Nb0.18, Ti0.1 , Nd0.06, N0.006, Cu0.14, P0.01, S0.003, Ce0.0008, Pr0.015, and the rest is Fe.

[0044] The method for preparing the above-mentioned low-temperature-resistant special-shaped steel pipe:

[0045] (1) Steel billet preparation: use high-quality scrap steel and iron as raw materials, use electric arc furnace for melting, and the melting temperature is 1580-1600°C. Slag agent 18kg / t, keep warm for 45-60min, remove slag, then adjust the temperature to 1660-1680°C, deoxidize for 20-30min, sample and analyze and adjust the composition according to the chemical composition requirements, when the temperature of molten steel reaches 1680-1700°C, the steel is tapped, Add 1.4kg / t steel aluminum cake to the molten steel before tapping for final deoxidation; electromagnetic stirring and atomization cooling are perfo...

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Abstract

The invention relates to the technical field of specially-shaped steel tubes and in particular relates to a low temperature-resistant specially-shaped steel tube and a preparation method of the low temperature-resistant specially-shaped steel tube. The low temperature-resistant specially-shaped steel tube comprises the following chemical components in percentage by mass: 0.06-0.18% of C, 0.2-0.4% of Si, 2.4-3.2% of Ni, 1.6-2.2% of Cr, 1.1-1.3% of Mn, 0.5-0.8% of Al, 0.3-0.6% of Mo, 0.12-0.24% of Nb, 0.06-0.14% of Ti, 0.04-0.07% of Nd, 0.005-0.007% of N, 0.08-0.18% of Cu, 0.008-0.012% of P, 0.001-0.004% of S, 0.0005-0.001% of Ce, 0.01-0.02% of Pr and the rest of Fe. The low temperature-resistant specially-shaped steel tube and the preparation method of the low temperature-resistant specially-shaped steel tube have the following advantages: (1) the specially-shaped steel tube is good in low-temperature impact toughness, can be used in an extremely low temperature region at the temperature being lower than 198 DEG C below zero for a long time, and is long in anti-fatigue service life, abrasion-resistant, corrosion-resistant, high in accuracy, good in welding property, good in overall straightness and low in residual stress; (2) the preparation method of the low temperature-resistant specially-shaped steel tube is simple in production process, low in cost, good in economic benefit and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of special-shaped steel pipes, in particular to a low-temperature-resistant special-shaped steel pipe and a preparation method thereof. Background technique [0002] Special-shaped steel pipe is a long strip of steel with a hollow section, widely used in automobiles, trains, airplanes, ships and space launchers and other structural components, mechanical parts, petrochemical, geological drilling, textile machinery, radio communications, medical and health, Completion and other fields. The use of special-shaped steel pipes to manufacture ring parts can improve the utilization rate of materials, simplify the manufacturing process, and save materials and processing hours. [0003] With the increasing demand for low-temperature equipment steel, the production and performance control of low-temperature steel has become a concern of people. It is well known that general structural steel undergoes a transition fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C21C5/54C21D1/18C21D8/10C21D9/08
CPCY02P10/20
Inventor 郭洪建杨日升
Owner 张家港市华尊宝特种材料科技有限公司
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