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We investigated the effect of hydrogen on the tensile properties of a quenchtempered lowalloy steel, SCM435, with the tensile strength of 930 MPa used for hydrogen storage cylinders. Tensile specimens were machined from a cylinder with the inside and outside diameters of 245 and 315 mm. The specimens were immersed in a 20 mass aqueous solution of ammonium thiocyanate (NH4SCN) at 313 K for 48 hours and then charged with hydrogen. Tensile tests were performed in the air at room temperature. The cross head speed was ranged from 0.01 to 100 mm/min. Hydrogencharged specimens were hold in the air for a period of 1 and 300 hours. The 0.2 proof stress and tensile strength for the hydrogencharged specimens were similar to those for the uncharged specimens, whereas the reduction of area was lower in the hydrogencharged specimens than in the uncharged specimens. Thermal desorption spectroscopy showed that the residual hydrogen contents in the hydrogencharged specimens fractured by tensile tests were between 0.14 and 0.93 mass ppm. The reduction of area of the hydrogencharged specimens decreased linearly with increasing residual hydrogen content. Scanning electron microscopy showed that the cupcorn fracture occurred in the hydrogencharged and the uncharged specimens and that the fracture surfaces were covered with dimples. The normal stress fracture area in the center of the hydrogencharged and uncharged specimens was almost the same. The shear stress fracture area near the specimen surface was wider in the hydrogencharged specimens than in the uncharged specimens. This means that hydrogen enhances slip deformation near the specimen surface and resulted in the lower reduction of area in the hydrogencharged specimen. We therefore concluded that the hydrogen embrittlement behavior of the 900MPaclass SCM435 steel was explained by the hydrogen enhanced localized plasticity model rather than by the lattice decohesion model.

Effect of Hydrogen on the Tensile Properties of 900-MPa-Class JIS-SCM435 Low-Alloy-Steel for Use in Storage Cylinder of Hydrogen Station