1.1 Standard classification used for steel pipes:
1.1.1 By region
(1) Domestic standards: national standards, industry standards, corporate standards
(2) International standards:
United States: ASTM, ASME
United Kingdom: BS
Germany: DIN
Japan: JIS
1.1.2 Divided by purpose: product standard, product inspection standard, raw material standard
1.2 The main content of the product standard includes the following:
Scope of application
Size, shape and weight (specification, deviation, length, curvature, ovality, delivery weight, marking)
Technical requirements: (chemical composition, delivery status, mechanical properties, surface quality, etc.)
experiment method
testing regulations
Packaging, labeling and quality certificate
1.3 Marking: there should be spray printing, stamping, roller printing, steel stamping or sticking stamp on the end of each steel pipe
The logo should include the steel grade, product specification, product standard number, and supplier’s logo or registered trademark
Each bundle of steel pipes packed in bundles (each bundle should have the same batch number) should have no less than 2 signs, and the signs should indicate: supplier’s trademark, steel brand, furnace number, batch number, contract number, product specification , Product standard, weight, number of pieces, date of manufacture, etc.
1.4 Quality Certificate: The delivered steel pipe must have a material certificate that complies with the contract and product standards, including:
Supplier’s name or imprint
Buyer’s name
Delivery date
Contract No
Product standards
Steel grade
Heat number, batch number, delivery status, weight (or number of pieces) and number of pieces
Variety name, specification and quality grade
Various inspection results specified in the product standard