... the quality profits with fine management, continuously strength its core competitive abilities, meet the customers ... brand A2, its conditions is H12, the tensile strength is 80-110 mpa,the elongation ratio is ... The brand A4, its conditions is H12, the tensile strength is 95-115 mpa, the elongation ratio is ... The brand A6, its conditions is H12, the tensile strength is 110-130 mpa, the elongation ratio is ...