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首页> 外国专利> round bar tensile tensile test sample for sulfide stress corrosion cracking of a steel, steel test method for sulfide stress corrosion cracking, and seamless steel tube which has excellent resistance to corrosion cracking under sulfide stress

round bar tensile tensile test sample for sulfide stress corrosion cracking of a steel, steel test method for sulfide stress corrosion cracking, and seamless steel tube which has excellent resistance to corrosion cracking under sulfide stress

机译：用于钢的硫化物应力腐蚀开裂的圆棒拉伸试验样品，硫化物应力腐蚀开裂的钢测试方法以及在硫化物应力下具有优异的耐腐蚀龟裂性的无缝钢管

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摘要

In the present invention, when a rod-shaped tensile test piece is immersed in a test liquid and subjected to a fixed load stress s (mpa) and the crack strength under sulphide stress is evaluated according to whether the part fractured until a prescribed time has elapsed, the rod-shaped tensile test piece used comprises a parallel portion, a shoulder portion and a grip portion; wherein the shoulder part is formed from a curve having two or more radii of curvature; wherein the radius of curvature r1 (mm) of the side in contact with the parallel part is at least 15 mm and satisfies (0,22 s - 119) = r1 = 100; the length x1 (mm), in the longitudinal direction of the test piece, of the portion of the curve having the radius of curvature r1 satisfies x1 = v {(r / 8) × (r1 - r2 / 4)} (here r is the radius (mm) of the parallel part of the rod tensile test piece); and the radius of curvature r1 is greater than the other radius of curvature. As a result, even if the steel is a high strength steel that has a yield strength of 758.42 mpa or more, the shoulder break is suppressed and the sulphide stress crack resistance can be adequately assessed.
机译：在本发明中，当将棒状拉伸试验片浸入试验液中并经受固定的载荷应力s（mpa）时，根据直到规定时间之前断裂的部分是否具有硫化物应力来评估硫化物的断裂强度。过去，所使用的棒状拉伸试验片包括平行部分，肩部和握持部分。其中，所述肩部由具有两个或更多个曲率半径的曲线形成;其中，与平行部分接触的一侧的曲率半径r1（mm）至少为15mm，并且满足（0.22s-119）＝ r1 ＝ 100。曲率半径为r1的那部分曲线在试件纵向上的长度x1（mm）满足x1 = v {（r / 8）×（r1-r2 / 4）}（此处r是杆拉伸试验件平行部分的半径（mm）;并且曲率半径r1大于另一个曲率半径。结果，即使该钢是具有758.42mpa或更大的屈服强度的高强度钢，也可以抑制肩部断裂并且可以充分地评估耐硫化物应力开裂性。

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