KR950000914A

KR950000914A - Austenitic stainless steel with excellent formability

Info

Publication number: KR950000914A
Application number: KR1019930010993A
Authority: KR
Inventors: 유도열
Original assignee: 박득표; 포항종합제철 주식회사; 백덕현; 재단법인 산업과학기술연구소
Priority date: 1993-06-16
Filing date: 1993-06-16
Publication date: 1995-01-03
Also published as: KR950007792B1

Abstract

본 발명은 주방싱크재등에 사용되는 오스테나이트계 스테인레스강에 관한 것으로써, 소재의 가공경화도에 영향을 주는 금속학적 인자인 γ상의 안정도(Md30), 적층결합에너지는 높이고, 항복강도를 낮게하므로서, 공가인 Ni의 첨가량을 감소기키더라도 우수한 성형성을 갖는 오스테나이트계 스테인레스강을 제공하고자 하는데, 그 목적이 있다.The present invention relates to austenitic stainless steels used in kitchen sinks, etc., by increasing the stability of the γ phase (Md30), the lamination bonding energy, and lowering the yield strength, which are metallurgical factors affecting the work hardening of the material. An object of the present invention is to provide an austenitic stainless steel having excellent moldability even if the amount of Ni added is reduced.

본 발명은, 중량%로, C : 0.045~0.08(wt%), P : 0.03(%)이하, S : 0.003(%)이하, Si : 0.55(%)이하, Mn : 0.85(%)이하, Cr : 18-18.5(%), Ni : 8-9(%), MO : 0.15(%)이하, Cu : 3(%)이하, Ti : 0.015(%)이하, B : 0.003(%)이하이고, 나머지 Fe 및 기타 불가피하게 첨가되는 불순물로 조서되고, 오스테나이트(γ) 안정화온도가 -10~-20℃이고, 적층결함에너지가 35(Jm/㎡)이상이고, 항복강도가 25㎏/㎟ 이하이고, 그리고 결정립이 ASTM 결정입도번호 6~9가 되도록 구성되는 성형성이 우수한 오스테나이트계 스테인레스강을 그 요지로 한다.The present invention, in weight%, C: 0.045 ~ 0.08 (wt%), P: 0.03 (%) or less, S: 0.003 (%) or less, Si: 0.55 (%) or less, Mn: 0.85 (%) or less, Cr: 18-18.5 (%), Ni: 8-9 (%), MO: 0.15 (%) or less, Cu: 3 (%) or less, Ti: 0.015 (%) or less, B: 0.003 (%) or less , Rest of Fe and other unavoidable impurities, austenite (γ) stabilization temperature is -10 ~ -20 ℃, stacking fault energy is more than 35 (Jm / ㎡), yield strength 25㎏ / ㎠ The austenitic stainless steel which is excellent in moldability comprised so that a crystal grain may be an ASTM grain size number 6-9 is below.

Description

Austenitic stainless steel with excellent formability

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

Claims

In austenitic stainless steel, by weight%, C: 0.045 to 0.5%, P: 0.03% or less, S: 0.003% or less, Si: 0.55% or less, Mn: 0.85% or less, Cr: 18-18.5%, Ni: 8-9%, MO: 0.15% or less, Cu: 3% or less, Ti: 0.015% or less, B: 0.003% or less, remainder Fe and other unavoidable impurities: Its grain size is ASTM crystal grain size Number 6-9; The austenite stabilization temperature (Md30) calculated as in the following formula (1) is

Md30 (° C.) = 551-462 (C% + N%) = 9.2Si% -8.1Mn% -29 (Ni% + Cu%)-13.7Cr% -18.5Mo% -68

Nb% 01.42 (ASTM Grain Size No.-8.0) ......... (1)

-10 to -2 ° C; The measurement defect energy (SFE) calculated as in the following equation (2),

Lamination Defect Energy (Jm / ㎡) = 25.7 + 2Ni% + 410C% -0.9Cr% -77N% -13Si% -1.2Mn% (2)

35 (Jm / m 2) or more; And the yield strength (kg / mm 2) calculated as in the following equation (3),

Yield strength (㎏ / ㎠) = 15.4 {4.4 + 23C% + 1.3Si% + 0.24Cr% + 0.94Mo% + 1.2V% + 0.29W% + 2.6

Nb% + 1.7 Ti% + 0.82Al% + 32N% + 0.16 (δ-ferrite Vo1.%) + 0.46d-1 / 2} .... (3) (where d = diameter of average grain size (mm) ) Austenitic stainless steel with excellent molding, characterized in that less than 25 (㎏ / ㎠).

The cup height (mm) of Claim 1 computed like following formula (4),

Cup Height (mm) = 3.015C% -0.58 Si% -2.019Mn% + 0.592Cr% + 2.33Ni% -0.653Mo%

+ 10.392Ti% + 5.9Cu% -27.747N% -0.035 (ASTM, G.S., No.) ............... (4)

Austenitic stainless steel having excellent moldability, characterized in that the component and grain size are controlled to be 29 (mm) or more.

※ Note: The disclosure is based on the initial application.