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a4-70 material, a4-70 material equivalent, a4-70 material properties, a4-70 material grade, a4-70 material yield strength, a4-70 material density, a4-70 material datenblatt, a4 70 material, a4-70 bolt material, a4 70 material grade, a4 70 material properties, is a4-70 material ss316 same
