摘要:
A ferritic stainless steel which exhibits improved formability and which is especially useful for making 950.degree. C. or 1000.degree. C. exhaust manifolds is disclosed, the steel composition thereof consisting essentially of, on the basis of weight:C: 0.02% or less, Si: 1.0% or less,Mn: 1.0% or less, P: 0.04% or less,S: 0.005% or less, Cu: 0.1-1.0%,Cr: 18.0-25.0%, Mo: 1.0 (exclusive)-3.0%,Nb: 0.1-1.0%, Al: 0.20% or less,N: 0.02% or less, B: 0-0.01%,C+N.ltoreq.0.03%,preferably, 21%.ltoreq.Cr+Mo+Nb.ltoreq.25%,Fe and incidental impurities: balance.
摘要翻译:公开了一种铁素体不锈钢,其表现出改善的成形性,并且特别可用于制备950℃或1000℃排气歧管,其钢组合物基本上由以C:0.02%或更少的重量组成, Si:1.0%以下,Mn:1.0%以下,P:0.04%以下,S:0.005%以下,Cu:0.1〜1.0%,Cr:18.0〜25.0%,Mo:1.0(排他性)-3.0 %,Nb:0.1〜1.0%,Al:0.20%以下,N:0.02%以下,B:0〜0.01%,C + N <0.03%,优选21% Nb≤25%,Fe和偶然杂质:平衡。
摘要:
A steel which does not suffer from hydrogen embrittlement contains 0.3-30% of Cr as the base material, and has an oxide film having a thickness of 100 nm or more formed on its surface. The oxide film contains at least two elements selected among Fe, Cr and Al in the form of oxides, respectively in an amount of 5 atom % or more. The oxide film is formed through single-step or two-step heating wherein the steel is heated in the atmosphere at 600-900° C. for not less than 3 minutes but not more than 2 hours if necessary, and then heated in a hydrogen atmosphere at 700-1200° C. for not less than 3 minutes but not more than 2 hours while controlling the water vapor partial pressure within the range from 10−8 to 10−1 MPa. The steel is adapted for use in hydrogen gas environments, such as a container or other hardware.
摘要:
An austenitic stainless steel for use in a hydrogen gas atmosphere comprises, in mass %, C: 0.10% or less, Si: 1.0% or less, Mn: 0.01 to 30%, P: 0.040% or less, S: 0.01% or less, Cr: 15 to 30%, Ni: 5.0 to 30%, Al: 0.10% or less, N: 0.001 to 0.30% with the balance Fe and inevitable impurities. An X-ray (111) integration intensity of a cross section along the direction rectangular to the working direction is five times that in a random direction or less, and the X-ray integration intensity ratio of a cross section along the working direction satisfies I(220)/I(111)≦10. The high strength steel can also contain one or more of the groups of Mo and W; V, Nb, Ta, Ti, Zr and Hf; B; Cu and Co; Mg, Ca, La, Ce, Y, Sm, Pr and Nd.
摘要:
A weld joint having a base material and a weld metal both of an austenitic steel, wherein the weld metal has a chemical composition, in mass %, that C: 0.04% or less, Si: 1.0% or less, Mn: 3% or less, P: 0.02% or less, S: 0.005% or less, Cr: 15 to 25%, Ni: 30% or more, Mo: 10% or less, Nb: 2.5 to 5%, Al: 3.0% or less, Ti: 0.5% or less, and the balance: Fe and inevitable impurities, the contents of Al and Ti satisfying the following: (Ti+Al)>Nb/8. The weld joint is a high strength austenitic steel weld joint which exhibits excellent toughness at a low temperature and excellent resistance to hydrogen embrittlement, which are required for a piping and a vessel for high pressure hydrogen, particularly also in a welded zone.
摘要翻译:具有基体材料和焊接金属的两种奥氏体钢的焊接接头,其中焊接金属具有质量%的化学组成,C:0.04%以下,Si:1.0%以下,Mn:3%, 较小,P:0.02%以下,S:0.005%以下,Cr:15〜25%,Ni:30%以上,Mo:10%以下,Nb:2.5〜5%,Al:3.0%以下 ,Ti:0.5%以下,余量为Fe和不可避免的杂质,Al和Ti的含量满足下列条件:(Ti + Al)> Nb / 8。 焊接接头是高强度奥氏体钢焊接接头,其特别是在焊接区域中,其表现出优异的低温韧性和优异的耐氢脆性,这是管道和高压氢气容器所必需的。
摘要:
A high-strength stainless steel, having good mechanical properties and corrosion resistance in a high-pressure hydrogen gas environment, is used as a container or other device for high-pressure hydrogen gas, and consists of, by mass %, C: not more than 0.04%, Si: not more than 1.0%, Mn: 7 to 30%, Cr: 15 to 22%, Ni: 5 to 20%, V: 0.001 to 1.0%, N: 0.20 to 0.50% and Al: not more than 0.10%, and the balance Fe and impurities. Among the impurities, P is not more than 0.030%, S is not more than 0.005%, and Ti, Zr and Hf are not more than 0.01% respectively, and the contents of Cr, Mn and N satisfy the relationship, 2.5Cr+3.4Mn≦300N. The weld metal of the welded joint of the container or other device made of the said stainless steel satisfies the relationship, −11≦Nieq−1.1×Creq≦−8.
摘要:
A high-strength stainless steel, having good mechanical properties and corrosion resistance in a high-pressure hydrogen gas environment, and excellent in stress corrosion cracking resistance, and a container or other device for high-pressure hydrogen gas, which is made of the said stainless steel, are provided. The stainless steel is characterized in that it consists of, by mass %, C: not more than 0.02%, Si: not more than 1.0%, Mn: 3 to 30%, Cr: more than 22% but not more than 30%, Ni: 17 to 30%, V: 0.001 to 1.0%, N: 0.10 to 0.50% and Al: not more than 0.10%, and the balance Fe and impurities. Among the impurities, P is not more than 0.030%, S is not more than 0.005%, and Ti, Zr and Hf are not more than 0.01% respectively, and the contents of Cr, Mn and N satisfy the following relationship [1]: 5Cr+3.4 Mn≦500 N [1].
摘要:
An austenitic stainless steel with minimized deformation by heating and cooling treatment after cold working, which consists of, % by mass, C: 0.03% or less, Si: 2 to 4%, Mn: 0.1 to 2%, P: 0.03% or less, S: 0.03% or less, Ni: 9 to 15%, Cr: 15 to 20%, N: 0.02 to 0.2%, Nb: 0.03% or less, each of Mo and Cu or a total of Mo and Cu: 0.2 to 4%, and the balance Fe and impurities, and satisfies the following formulas (1) and (2). This steel can also have good weldability when the following formula (3) is also satisfied in addition to the formulas (1) and (2); 16.9+6.9Ni+12.5Cu−1.3Cr+3.2Mn+9.3Mo−205C−38.5N−6.5Si−120Nb≧40 (1) 450−440(C+N)−12.2Si−9.5Mn−13.5Cr−20(Cu+Ni)−18.5Mo≦−90 (2) 8.2+30(C+N)+0.5Mn+Ni−1.1(1.5Si+Cr+Mo)+2.5Nb≦−0.8 (3) wherein each element symbol in the formulas (1), (2) and (3) represents the content, % by mass, of each element included in the steel.
摘要:
An austenitic stainless steel for use in a hydrogen gas atmosphere comprises, in mass %, C: 0.10% or less, Si: 1.0% or less, Mn: 0.01 to 30%, P: 0.040% or less, S: 0.01% or less, Cr: 15 to 30%, Ni: 5.0 to 30%, Al: 0.10% or less, N: 0.001 to 0.30 % with the balance Fe and inevitable impurities. An X-ray (111) integration intensity of a cross section along the direction rectangular to the working direction is five times that in a random direction or less, and the X-ray integration intensity ratio of a cross section along the working direction satisfies I(220)/I(111)≦10. The high strength steel can also contain one or more of the groups of Mo and W; V, Nb, Ta, Ti, Zr and Hf; B; Cu and Co; Mg, Ca, La, Ce, Y, Sm, Pr and Nd.
摘要:
A high-strength stainless steel, having good mechanical properties and corrosion resistance in a high-pressure hydrogen gas environment, is used as a container or other device for high-pressure hydrogen gas, and consists of, by mass %, C: not more than 0.04%, Si: not more than 1.0%, Mn: 7 to 30%, Cr: 15 to 22%, Ni: 5 to 20%, V: 0.001 to 1.0%, N: 0.20 to 0.50% and Al: not more than 0.10%, and the balance Fe and impurities. Among the impurities, P is not more than 0.030%, S is not more than 0.005%, and Ti, Zr and Hf are not more than 0.01% respectively, and the contents of Cr, Mn and N satisfy the relationship, 2.5Cr+3.4Mn≦300N. The weld metal of the welded joint of the container or other device made of the said stainless steel satisfies the relationship, −11≦Nieq−1.1×Creq≦−8.
摘要:
Provided is a low alloy steel for high-pressure hydrogen gas environments, which contains, by mass percent, C: 0.15 to 0.60%, Si: 0.05 to 0.5%, Mn: 0.05 to 3.0%, P: not more than 0.025%, S: not more than 0.010%, Al: 0.005 to 0.10%, Mo: 0.5 to 3.0%, V: 0.05 to 0.30%, O (oxygen): not more than 0.01%, N: not more than 0.03%, and the balance Fe and impurities, and has tensile strength of not less than 900 MPa. This low alloy steel desirably contains B of 0.0003 to 0.003%, but in this case, N is limited to not more than 0.010%. It is desirable to contain at least one among Cr, Nb, Ti, Zr, and Ca. The contents of Mo and V desirably satisfy the following formula (1): [Mo(%)]·[V(%)]0.2≧0.32 (1).