Development of a Tungsten Strengthened Low Alloy Steel with Improved Weldability

Effects of mo addition on intergranular cracking behavior of 2.25CrW (P23) weld metal at elevated temperatures

“…T/P23 steel tubes or pipes (2.25Cr1.6W) have been developed for high temperature applications in settings such as chemical and fossil-fuel power plants [1,2]. Studies have shown that T/P23 exhibits improved weldability and creep rupture strength compared to conventional T/P22 (2.25Cr1Mo).…”

“…Studies have shown that T/P23 exhibits improved weldability and creep rupture strength compared to conventional T/P22 (2.25Cr1Mo). This advantage is attributed to the addition of the solid solution hardening element W and the precipitation strengthening elements V and Nb [1][2][3]. However, creep-resistant and precipitation-strengthened materials such as T/P22 and T/P23 are known to be susceptible to intergranular postweld heat treatment (PWHT) cracking [4][5][6][7][8][9][10].…”

Creep Modeling for Life Evaluation of Heat-resistant Steel with a Martensitic Structure

“…[5] and [6] First of all, the regions where eqs. [1] and L2] are applicable must be determined by eliminating time, t from these eq~rations. The resultant equation is as follows: g* ={ In (i~* /~) / (~+~*).…”

“…Eq. [1] is valid when the strain is larger than E *, while Eq: [2] is applicable whenthe strain is less than E *. Figure 3 also shows that the actual creep rates C 2001 ISIJ are always greater than those calculated from Eqs.…”

“…Figure 3 also shows that the actual creep rates C 2001 ISIJ are always greater than those calculated from Eqs. [1] and [2] J r \ l t* = I expk~* g*/~1 J / (~* io*) . .…”