Duplex stainless steel material and duplex stainless steel pipe
A technology of duplex stainless steel and steel, applied in the field of duplex stainless steel and duplex stainless steel pipe, can solve problems such as insufficient hot workability, and achieve the effect of good hot workability and good corrosion resistance
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Embodiment 1
[0109] [Example 1: Example regarding Ta-containing steel]
[0110] (Preparation of sample)
[0111] Steels having the compositions shown in Table 1 (steel symbols A to Z) were melted using a molten steel processing facility equipped with an electrode arc heating function, and cast using a 50 kg circular mold (body: about φ140×320 mm). The solidified steel ingot was heated to 1200°C, hot forged at this temperature, then cut, subjected to solution heat treatment held at 1100°C for 30 minutes, and water-cooled to be processed into a 600 × 120 × 60 mm steel forging product (test). Material No.1~26).
[0112] In addition, PRE=[Cr]+3.3[Mo]+16[N] of each steel was calculated, and Table 1 also shows the result. In addition, the processed steel forgings were embedded with a cross section parallel to the machining direction, mirror-polished, electrolytically etched in an oxalic acid aqueous solution, and then observed with an optical microscope at a magnification of 100 times to confi...
Embodiment 2
[0126] [Example 2: Example concerning Ge-containing steel]
[0127] (Preparation of test materials No. 1 to 17)
[0128] Using the molten steel processing equipment with the electrode electric heating function, the stainless steel with the composition shown in Table 3 (the balance is Fe and unavoidable impurities) was melted separately, and a 50kg rectangular casting mold (body: about 120×450mm) was used. cast. In addition, Table 3 also shows the results of calculating the PRE value for the structure of each steel. In addition, in Table 3, the blank column shows that this component is not contained. The solidified steel ingot was heated to 1200° C., hot forged at this temperature, and processed into a steel forging product of 600×120×60 mm. Then, it cut|disconnected, was hold|maintained at 1100 degreeC for 30 minutes as a heat processing, and performed water cooling.
[0129] (Extraction of test materials No. 1 to 17)
[0130] Next, using a sample (20 mm×30 mm×2 mmt) extr...
Embodiment 3
[0140] [Example 3: Example in the case of controlling sulfur-oxide-based composite inclusions in Ta-containing steel]
[0141] (production of steel)
[0142] Steels (steel grades: A1 to A16, B1 to B9) with the compositions shown in Table 4 were smelted using a molten steel processing facility equipped with an electrode electric arc heating function, and a 50 kg circular casting mold (body: about φ140×320 mm) was used. ) for casting. In addition, Table 4 also shows the calculation results of PRE=[Cr]+3.3[Mo]+16[N] for each steel. In addition, in the column of the component composition of Table 4, the blank column indicates that the component is not contained, and the balance is Fe and inevitable impurities.
[0143] The solidified steel ingot is heated to 1200°C, hot forged at this temperature (forging temperature: 1000 to 1200°C), and then cut. Next, cold rolling and solution heat treatment of holding at 1100° C. for 30 minutes were performed, water-cooled at a cooling rate...
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