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Low-cost austenitic stainless steel with excellent corrosion resistance

A technology for austenitic stainless steel and corrosion resistance, applied in the field of austenitic stainless steel, can solve the problems of poor pitting corrosion resistance and formability, limited improvement, poor pitting corrosion resistance, etc., to achieve cost reduction and excellent corrosion resistance The effect of high stability and good thermal processing performance

Active Publication Date: 2012-01-25
BAOSTEEL DESHENG STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low content of Mo in this type of steel, the pitting corrosion resistance is poor, and a large amount of strengthening elements Cr, Mn and N will lead to poor processing performance of this material. Although the addition of a small amount of Cu is beneficial to improve its cold workability, it can improve To a limited extent, its pitting resistance and formability are inferior to 316L series austenitic stainless steel

Method used

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  • Low-cost austenitic stainless steel with excellent corrosion resistance
  • Low-cost austenitic stainless steel with excellent corrosion resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0031] Follow the steps below to manufacture:

[0032] (1) Use non-vacuum induction furnace, electric furnace + AOD dual process or electric furnace + AOD + VOD triple process for smelting and casting;

[0033] (2) Hot-rolled into hot-rolled coils with different specifications of 6-12 mm, solution heat treatment at 1080 ° C, and then pickling;

[0034] (3) The above pickled hot-rolled coil was further cold-rolled into a 2 mm cold-rolled sheet.

[0035] Table 1 is the chemical composition table of Examples 1-4 and conventional austenitic stainless steels 304L and 316L as comparative examples.

[0036] Table 1. Chemical composition (weight percent) of embodiment 1-4 and comparative example

[0037]

C

Si

mn

P

S

Cr

Ni

N

Mo

Cu

B

Val

(δ)

Si / M

no

Md3

0

Reality

Shi

example 1

...

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PUM

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Abstract

The invention discloses low-cost austenitic stainless steel with excellent corrosion resistance, which comprises the following chemical elements in mass percentage: smaller than or equal to 0.04% of C, 16.00-19.00% of Cr, 8.00-10.00% of Ni, 0.50-1.50% of Mo, 2.10-4.50% of Cu, 0.02-0.08% of N, smaller than or equal to 0.80% of Mn, 1.30-2.50% of Si, smaller than or equal to 0.04% of P, smaller thanor equal to 0.005% of S, 0.0010-0.0040% of B and the balance of Fe and other inevitable impurities, and the ratio of Si to Mn is 2.5 to 4. The corrosion resistance and mechanical properties of the austenitic stainless steel are far better than those of 304L or approach or reach the level of 316L austenitic stainless steel, but the cost is lowered by 20-30% as compared with that of the 316L austenitic stainless steel.

Description

technical field [0001] The invention relates to an austenitic stainless steel, in particular to an austenitic stainless steel with excellent corrosion resistance and low cost. Background technique [0002] The high content of chromium in the 18-8 series austenitic stainless steel (such as 304) ensures its excellent corrosion resistance, especially for oxidizing acids (such as nitric acid). Most organic acids and inorganic acids also have certain corrosion resistance. The nickel content of more than 8% in this type of steel ensures that it has excellent room temperature plasticity and formability. Its solid solution structure is austenite plus a small amount of Ferrite structure, a small amount of ferrite structure ensures its excellent welding performance, and the metastable structure ensures that it can be strengthened by martensitic deformation during cold working deformation. Due to the above excellent performance in all aspects, 304 is Austenitic stainless steel is one ...

Claims

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Application Information

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IPC IPC(8): C22C38/54
Inventor 淮凯文许海刚罗明崔培耀
Owner BAOSTEEL DESHENG STAINLESS STEEL
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