Abstract: A method for evaluating local buckling performance of a steel pipe includes obtaining a stress-strain relationship of a material having a yield plateau in the stress-strain relationship; determining the comparison of a starting strain of strain-hardening in the stress-strain relationship obtained and a critical strain of the steel pipe; and evaluating that the steel pipe has a possibility of being applied to a structure that requires plastic design when the critical strain is determined to be larger than the starting strain and evaluating that the steel pipe has no possibility of being applied to a structure that requires plastic design when the critical strain is determined to be not larger than the starting strain.

Abstract: A method for evaluating local buckling performance of a steel pipe includes obtaining a stress-strain relationship of a material having a yield plateau in the stress-strain relationship; determining the comparison of a starting strain of strain-hardening in the stress-strain relationship obtained and a critical strain of the steel pipe; and evaluating that the steel pipe has a possibility of being applied to a structure that requires plastic design when the critical strain is determined to be larger than the starting strain and evaluating that the steel pipe has no possibility of being applied to a structure that requires plastic design when the critical strain is determined to be not larger than the starting strain.

Abstract: A method for evaluating local buckling performance of a steel pipe includes obtaining a stress-strain relationship of a material having a yield plateau in the stress-strain relationship; determining the comparison of a starting strain of strain-hardening in the stress-strain relationship obtained and a critical strain of the steel pipe; and evaluating that the steel pipe has a possibility of being applied to a structure that requires plastic design when the critical strain is determined to be larger than the starting strain and evaluating that the steel pipe has no possibility of being applied to a structure that requires plastic design when the critical strain is determined to be not larger than the starting strain.

Abstract: A martensitic stainless steel pipe having a heat-affected zone with high resistance to intergranular stress corrosion cracking is provided. In particular, the martensitic stainless steel pipe contains less than 0.0100% of C; less than 0.0100% of N; 10% to 14% of Cr; and 3% to 8% of Ni on a mass basis. Alternatively, the martensitic stainless steel pipe may further contain Si, Mn, P, S, and Al within an appropriate content range. The martensitic stainless steel pipe may further contain one or more selected from the group consisting of 4% or less of Cu, 4% or less of Co, 4% or less of Mo, and 4% or less of W and one or more selected from the group consisting of 0.15% or less of Ti, 0.10% or less of Nb, 0.10% or less of V, 0.10% or less of Zr, 0.20% or less of Hf, and 0.20% or less of Ta on a mass basis. The content Csol defined by the following equation is equal to less than 0.0050%: Csol=C??×Cpre, wherein Cpre=12.0 {Ti/47.9+½(Nb/92.9+Zr/91.2)+?(V/50.9+Hf/178.5+Ta/180.9)?N/14.0} or Cpre=0 when Cpre<0.

Abstract: A method for evaluating local buckling performance of a steel pipe includes obtaining a stress-strain relationship of a material having a yield plateau in the stress-strain relationship; determining the comparison of a starting strain of strain-hardening in the stress-strain relationship obtained and a critical strain of the steel pipe; and evaluating that the steel pipe has a possibility of being applied to a structure that requires plastic design when the critical strain is determined to be larger than the starting strain and evaluating that the steel pipe has no possibility of being applied to a structure that requires plastic design when the critical strain is determined to be not larger than the starting strain.

Abstract: A method for determining a strain hardening property of a pipe enabling reduction of costs while ensuring pipeline integrity is provided. Moreover, a method for manufacturing a pipe based on the method for determining the strain hardening property of the pipe, a pipe manufactured by means of the method for manufacturing the pipe, and a pipeline are proposed. The method for determining the strain hardening property of the pipe according to the present invention includes a step of defining pipe dimensions where a diameter D, a thickness t, and a required critical local buckling strain ?req of the pipe are set as conditions to be satisfied; a step of acquiring a strain hardening property for acquiring the strain hardening property in the vicinity of a buckling point of the pipe satisfying the conditions set in the step of defining the pipe dimensions; and a step of setting the strain hardening property as a condition to be satisfied by the stress-strain curve of the pipe.

Abstract: A martensitic stainless steel pipe having a heat-affected zone with high resistance to intergranular stress corrosion cracking is provided. In particular, the martensitic stainless steel pipe contains less than 0.0100% of C; less than 0.0100% of N; 10% to 14% of Cr; and 3% to 8% of Ni on a mass basis. Alternatively, the martensitic stainless steel pipe may further contain Si, Mn, P, S, and Al within an appropriate content range. The martensitic stainless steel pipe may further contain one or more selected from the group consisting of 4% or less of Cu, 4% or less of Co, 4% or less of Mo, and 4% or less of W and one or more selected from the group consisting of 0.15% or less of Ti, 0.10% or less of Nb, 0.10% or less of V, 0.10% or less of Zr, 0.20% or less of Hf, and 0.20% or less of Ta on a mass basis. The content Csol defined by the following equation is equal to less than 0.0050%: Csol=C??×Cpre, wherein Cpre=12.0{Ti/47.9+½(Nb/92.9+Zr/91.2)+?(V/50.9+Hf/178.5+Ta/180.9)?N/14.0} or Cpre=0 when Cpre<0.

Abstract: A method for determining a strain hardening property of a pipe enabling reduction of costs while ensuring pipeline integrity is provided. Moreover, a method for manufacturing a pipe based on the method for determining the strain hardening property of the pipe, a pipe manufactured by means of the method for manufacturing the pipe, and a pipeline are proposed. The method for determining the strain hardening property of the pipe according to the present invention includes a step of defining pipe dimensions where a diameter D, a thickness t, and a required critical local buckling strain ?req of the pipe are set as conditions to be satisfied; a step of acquiring a strain hardening property for acquiring the strain hardening property in the vicinity of a buckling point of the pipe satisfying the conditions set in the step of defining the pipe dimensions; and a step of setting the strain hardening property as a condition to be satisfied by the stress-strain curve of the pipe.

Abstract: Ferrous group shape memory alloys consisting essentially of Cr: 16.0-21.0 wt %, Si: 3.0-7.0 wt % and Ni: 11.0-21.0 wt % and satisfying Ni wt %.gtoreq.[0.67.times.{Cr+1.2.times.(Si+Ti+Zr+Hf+V+Nb+Ta)}-] wt % and (Cr+Si) wt %.gtoreq.20 wt %, these ferrous-group shape-memory alloys having a corrosion resistance, a shape-memorizing properties, an intergranular corrosion resistance and a stress corrosion cracking resistance in nitric acid for nuclear fuel reprocessing plants and high-temperature, high-pressure water for light-water reactors.

Abstract: A high strength and corrosion resistant titanium alloy having excellent corrosion-wear properties may be prepared in that Al and Mo are added as alloying elements in specific amounts, and if Zr in a specific amount is further added, the strength and the corrosion-wear properties would be more improved.