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Steel tube formula

A steel pipe and formula technology, applied in the direction of pipes, rigid pipes, pipes/pipe joints/fittings, etc., can solve the problem of reducing the corrosion resistance of stainless steel, improve the ability of sulfuric acid resistance, good strength and toughness, and refine grains Effect

Inactive Publication Date: 2011-01-12
JIANGSU JINDI SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the above problems, the present invention provides a steel pipe formula to solve the problem that the content of chromium carbide will reduce the corrosion resistance of stainless steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: A steel pipe formula, composed of Fe, C, Mn, P, S, Si, Cr, Mo, N, Ti, Nb, according to the mole percentage relative to Fe: C=0.025, Mn=1.00, P =0.040, S=0.030, Si=1.00, Cr=17.5, Mo=1.75, N=0.035, Ti=0.08, Nb=0.15, formulated and processed.

Embodiment 2

[0012] Embodiment 2: A steel pipe formula, composed of Fe, C, Mn, P, S, Si, Cr, Mo, N, Ti, Nb, according to the mole percentage relative to Fe: C=0.02, Mn=0.8, P =0.03, S=0.02, Si=0.8, Cr=18.5, Mo=2, N=0.03, Ti=0.06, Nb=0.14, formulated and processed.

Embodiment 3

[0013] Embodiment 3: A steel pipe formula, composed of Fe, C, Mn, P, S, Si, Cr, Mo, N, Ti, Nb, according to the mole percentage relative to Fe: C=0.015, Mn=0.6, P =0.02, S=0.01, Si=0.6, Cr=19.5, Mo=2.5, N=0.02, Ti=0.04, Nb=0.12, formulated and processed.

[0014] The smelting method adopted in the steel pipe formula includes: adopting any one of the proportioning content in the above three embodiments,

[0015] The first step of smelting

[0016] 1. This steel type is smelted by the return method,

[0017] 2. More than 80% of the electric furnace is melted, and oxygen is used to boost the melting to ensure the loss of chromium and the burning of steel materials.

[0018] 3. After melting, the temperature is >1650°C, it can be reduced, fully analyzed, and the composition must be adjusted by adding 0.5% or 0.8% to the off-line chromium, adjusting molybdenum on the off-line, and carbon > 0.8%.

[0019] The second refinement

[0020] 1. Blend into the refining furnace (AOD) at...

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PUM

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Abstract

The invention provides a steel tube formula which consists of Fe, C, Mn, P, S, Si, Cr, Mo, N, Ti and Nb. Reasonable titanium and niobium content is added to the formula for stability treatment on a chromium-depleted zone, which can improve high-temperature strength of steel, avoid crystal grains growth under high temperature, play a role of refining the crystal grains, and eliminate or relieve the intercrystalline corrosion atmosphere of the steel. Addition of molybdenum can help strengthen corrosion resistance function of chromium in the steel, so sulfuric acid resistance capability can be improved by adding a reasonable amount of the molybdenum. Various structures of stainless steel are obtained by chemical components and heat treatment, thus structures decide properties and the properties decide use. The steel obtained by the formula has good strength and good toughness.

Description

technical field [0001] The invention relates to a stainless steel seamless steel pipe in the metallurgical industry, in particular to the formula of S44400 steel pipe. Background technique [0002] Generally, the so-called stainless steel is a general term for stainless steel, heat-resistant steel, and acid-resistant steel. Stainless steel can be divided into two categories according to its composition, one is simple chromium steel containing more than 12% chromium, and the other is steel with other elements added on the basis of simple chromium steel containing more than 12% chromium quantum mechanics. [0003] The chromium carbide based on the combination of carbon and chromium will reduce the corrosion resistance of stainless steel, so the carbon content of stainless steel is low, generally within the range of 0.1-0.2%, and not exceeding the transition period of 0.4%. Contents of the invention [0004] Based on the above problems, the present invention provides a steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28F16L9/02
Inventor 王德元庄为民范伟昌文茂广穆志强
Owner JIANGSU JINDI SPECIAL STEEL CO LTD
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