公开(公告)号：KR100419637B1

公开(公告)日：2004-02-25

申请号：KR1020010026744

申请日：2001-05-16

Applicant: 철강융합신기술연구조합 ,  재단법인 포항산업과학연구원

Inventor： 정재영 ,  이대수 ,  마봉열

IPC: C21D8/00

Abstract: PURPOSE: Provided is a method for improving hot workability of free machining austenitic stainless steel by controlling the shape of delta-ferrite in soaking process with no addition of B. CONSTITUTION: In the heat treatment method of free machining austenitic stainless steel that includes the step of soaking a steel comprising C 0.15 wt.% or less, Si 1.0 wt.% or less, Mn 1.0-3.5 wt.%, S 0.1-0.4 wt.%, Cr 16-19 wt.%, Ni 8-14 wt.%, Mo 2.5 wt.% or less, Cu 4 wt.% or less, N 0.08 wt.% or less, unavoidable impurities and a balance of Fe at 1220 to 1260 deg.C, the method is characterized in that the average ratio of major axis and minor axis of delta-ferrite is within the range of 1.0 to 2.5 and its size is 5 to 35 mm; Mn/S is higher than 4; and oxygen content in the free machining austenitic stainless steel is 0.007 to 0.011 %.

Abstract translation: 目的：提供一种通过在浸泡过程中控制δ铁素体的形状而不添加B来改善易切削奥氏体不锈钢的热加工性的方法。组成：在包括步骤（a）的热处理奥氏体不锈钢的热处理方法中， ，含有C：0.15重量％以下，Si：1.0重量％以下，Mn：1.0〜3.5重量％，S：0.1〜0.4重量％，Cr：16〜19重量％，Ni：8〜14重量％ ，Mo：2.5重量％以下，Cu：4重量％以下，N：0.08重量％以下，不可避免的杂质，剩余部分Fe在1220〜1260℃的范围内，其特征在于， δ铁素体的长轴与短轴之比在1.0至2.5的范围内并且其尺寸为5至35mm; Mn / S高于4; 而易切削奥氏体不锈钢的氧含量为0.007〜0.011％。

公开(公告)号：KR1020020078439A

公开(公告)日：2002-10-18

申请号：KR1020010018798

申请日：2001-04-09

Applicant: 철강융합신기술연구조합 ,  재단법인 포항산업과학연구원

Inventor： 정재영 ,  이대수 ,  마봉열

IPC: C22C38/42

Abstract: PURPOSE: A free machining austenitic stainless steel having superior hot workability is provided, which is manufactured by controlling the amount of delta-ferrite in austenitic stainless steel with no addition of alloying element such as B. CONSTITUTION: The free machining austenitic stainless steel comprises C 0.15 wt.% or less, Si 1.0 wt.% or less, Mn 1.0 to 3.5 wt.%, S 0.15 to 0.40 wt.%, Cr 16 to 19 wt.%, Ni 8 to 14 wt.%, Mo 2.5 wt.% or less, Cu 4 wt.% or less, N 0.08 wt.% or less, a balance of Fe and other unavoidable impurities, wherein the portion of delta-ferrite in the free machining austenitic stainless steel is less than 6 wt.%, Mn/S is higher than 6 and the oxygen portion in the free machining austenitic stainless steel is 0.007 to 0.11 wt.%.

Abstract translation: 目的：提供一种具有优异的热加工性的免费加工奥氏体不锈钢，其通过在不添加诸如B的合金元素的情况下控制奥氏体不锈钢中的δ-铁素体的量来制造。构成：自由加工奥氏体不锈钢包括C 0.15重量％以下，Si 1.0重量％以下，Mn：1.0〜3.5重量％，S：0.15〜0.40重量％，Cr：16〜19重量％，Ni：8〜14重量％，Mo：2.5重量％ ％以下，Cu 4重量％以下，N 0.08重量％以下，余量由Fe和其他不可避免的杂质构成，其中游离加工奥氏体不锈钢中的δ-铁素体部分小于6重量％。 ％，Mn / S高于6，自由加工奥氏体不锈钢中的氧部分为0.007〜0.11重量％。

公开(公告)号：KR1020020087750A

公开(公告)日：2002-11-23

申请号：KR1020010026744

申请日：2001-05-16

Applicant: 철강융합신기술연구조합 ,  재단법인 포항산업과학연구원

Inventor： 정재영 ,  이대수 ,  마봉열

IPC: C21D8/00

Abstract: PURPOSE: Provided is a method for improving hot workability of free machining austenitic stainless steel by controlling the shape of delta-ferrite in soaking process with no addition of B. CONSTITUTION: In the heat treatment method of free machining austenitic stainless steel that includes the step of soaking a steel comprising C 0.15 wt.% or less, Si 1.0 wt.% or less, Mn 1.0-3.5 wt.%, S 0.1-0.4 wt.%, Cr 16-19 wt.%, Ni 8-14 wt.%, Mo 2.5 wt.% or less, Cu 4 wt.% or less, N 0.08 wt.% or less, unavoidable impurities and a balance of Fe at 1220 to 1260 deg.C, the method is characterized in that the average ratio of major axis and minor axis of delta-ferrite is within the range of 1.0 to 2.5 and its size is 5 to 35 mm; Mn/S is higher than 4; and oxygen content in the free machining austenitic stainless steel is 0.007 to 0.011 %.

Abstract translation: 目的：提供通过在不添加B的情况下通过在均热处理中控制δ-铁素体的形状来改善自由加工奥氏体不锈钢的热加工性的方法。构成：在自由加工奥氏体不锈钢的热处理方法中，包括步骤 浸渍钢，其包含C 0.15重量％以下，Si 1.0重量％以下，Mn 1.0-3.5重量％，S 0.1-0.4重量％，Cr 16-19重量％，Ni 8-14重量％ ％，Mo 2.5重量％以下，Cu 4重量％以下，N 0.08重量％以下，不可避免的杂质，余量为1220〜1260℃的Fe，该方法的特征在于平均 δ-铁素体的长轴和短轴的比例在1.0至2.5的范围内，其尺寸为5至35mm; Mn / S高于4; 自由加工奥氏体不锈钢中的氧含量为0.007〜0.011％。

公开(公告)号：KR100431830B1

公开(公告)日：2004-05-17

申请号：KR1020010018798

申请日：2001-04-09

Applicant: 철강융합신기술연구조합 ,  재단법인 포항산업과학연구원

Inventor： 정재영 ,  이대수 ,  마봉열

IPC: C22C38/42

Abstract: PURPOSE: A free machining austenitic stainless steel having superior hot workability is provided, which is manufactured by controlling the amount of delta-ferrite in austenitic stainless steel with no addition of alloying element such as B. CONSTITUTION: The free machining austenitic stainless steel comprises C 0.15 wt.% or less, Si 1.0 wt.% or less, Mn 1.0 to 3.5 wt.%, S 0.15 to 0.40 wt.%, Cr 16 to 19 wt.%, Ni 8 to 14 wt.%, Mo 2.5 wt.% or less, Cu 4 wt.% or less, N 0.08 wt.% or less, a balance of Fe and other unavoidable impurities, wherein the portion of delta-ferrite in the free machining austenitic stainless steel is less than 6 wt.%, Mn/S is higher than 6 and the oxygen portion in the free machining austenitic stainless steel is 0.007 to 0.11 wt.%.

Abstract translation: 目的：提供一种具有优良热加工性的易切削奥氏体不锈钢，其通过控制奥氏体不锈钢中的δ铁素体的量而不添加合金元素如B来制造。组成：所述易切削奥氏体不锈钢包含C 0.15重量％或更少，Si 1.0重量％或更少，Mn 1.0-3.5重量％，S 0.15-0.40重量％，Cr 16-19重量％，Ni 8-14重量％，Mo 2.5重量％ 以下，Cu：4重量％以下，N：0.08重量％以下，余量由Fe和其他不可避免的杂质构成，其中，所述易切削奥氏体系不锈钢中的δ铁素体的含量小于6重量％ ％，Mn / S高于6，并且所述易切削奥氏体不锈钢中的氧含量为0.007-0.11重量％。