American steel product standards

US steel products are with more standards, mainly in the following categories:
ANSI--American National Standard
AISI--American Society of Iron and Steel Standards
ASTM--American Society for Testing and Materials
ASME--American Society of Mechanical Engineers
AMS--Aerospace material specifications (one of the most commonly used materials specifications in the US aviation industry, developed by SAE)
API--American Petroleum Institute standards
AWS--American Welding Association Standard
SAE--American Society of Automotive Engineers Standards
MIL--US military standards
Qq--US federal government standards
API--American Petroleum Institute standards
ANSI--American National Standard
ASME--American Society of Mechanical Engineers
ASTM--American Society for Testing and Materials

These standards, all belong to the US steel standards, such as ASME in the material used by the standards are from ASTM, the valve in the standard reference API, and carbon steel pipe fittings from the ANSI standard. The difference lies in the different focus of the industry, so the adoption of different standards. API, ASTM, ASME are members of ANSI. American National Standards Institute standards, the vast majority from the professional standards. On the other hand, the professional associations, associations, groups can also be based on existing national standards to develop certain product standards. Of course, can not follow the national standard to develop their own association standards. ANSI standards are voluntary. The United States believes that mandatory standards may limit productivity gains. But by the law and the government departments to develop standards, generally a mandatory standard.