What are the items that need to be tested before the steel pipe leaves the factory

Main test items for steel pipes:
The following 8 aspects are the main test items for seamless steel pipes, precision steel pipes, precision drawn steel pipes, precision rolled steel pipes, and welded steel pipes:
①Appearance size test: surface quality, wall thickness, outer diameter test, inner diameter test, concentricity test, surface smoothness and finish test, straightness test, etc.
②Mechanical property test: tensile test, tensile strength, impact test, bending test, compression test, shear test, breaking test, yield strength, elongation after fracture, peeling test, fatigue test, flattening test, etc.
③Chemical composition analysis: C, Si, Mn, P, S, Cr, Ni, Cu, Mo, Ti, V, N, Al, etc.
④Coating test: coating quality, zinc layer adhesion, uniformity, coating thickness, corrosion resistance test.
⑤Metallographic analysis: metallographic test, microstructure, macrostructure, grain size, non-metallic inclusions, energy spectrum analysis, etc.
⑥ Nondestructive testing: ultrasonic testing, ultrasonic welding, nondestructive testing, eddy current testing, etc.
⑦ Salt spray test: salt spray test........ etc.
⑧ Other testing items required by customer orders.

Steel pipe inspection standards (partial):
CJ/CJT 151-2016 Thin-walled stainless steel pipe
GB/T 12770-2012 Stainless steel welded steel pipe for mechanical structure
GB/T 13296-2013 Stainless steel seamless steel pipe for boiler and heat exchanger
GB/T 5310-2017 Seamless steel pipe for high-pressure boiler
GB/T 14291-2016 Electric welded steel pipe for mineral powder and slurry transportation
GB/T 14975-2012 Stainless steel seamless steel pipe for structure
GB/T 8162-2018 Seamless steel pipe for structure
GB/T 14976-2012 Stainless steel seamless steel pipe for fluid transportation
GB/T 32958-2016 Stainless steel composite steel pipe for fluid transportation
GB/T 8163-2018 Seamless steel pipe for fluid transportation
GB/T 18984-2016 Seamless steel pipe for low temperature pipelines
........etc.

Types of steel pipes that can be tested:
Pressure steel pipes, spiral steel pipes, straight seam steel pipes, seamless steel pipes, cold-rolled precision seamless steel pipes, stainless steel pipes, stainless steel seamless steel pipes, 316L stainless steel pipes, 304 stainless steel pipes, hot-rolled seamless steel pipes, seamless steel pipes for fluids, welded steel pipes, hot-rolled grouting steel pipes, galvanized steel pipes, hot-dip galvanized steel pipes, hot-dip plastic steel pipes, plastic-lined composite steel pipes, galvanized steel pipes, plastic-coated steel pipes, carbon structural steel pipes, square steel pipes, hot-dip galvanized square steel pipes, scaffolding steel pipes, seamless steel pipes for dissolution casings, cold-drawn special-shaped steel pipes, metal bellows, sonic detection pipes, stainless steel welded steel pipes for fluid transportation, ductile iron pipes for water and gas, pipe fittings and accessories, boilers, hot Stainless steel seamless steel pipes for exchangers, straight seam electric welded steel pipes, hot-rolled seamless steel pipes for hydraulic pillars, stainless steel composite pipes for structures, seamless steel pipes for high-pressure boilers, seamless steel pipes for fluid transportation, welded steel pipes for low-pressure fluid transportation, hot-rolled seamless alloy steel boiler pipes, longitudinally welded steel pipes, weather-resistant welded steel pipes for structures, stainless steel ultra-thin-wall seamless steel pipes, seamless steel pipes for drilling, epoxy-coated seamless steel pipes, seamless steel pipes for fertilizer equipment, seamless steel pipes for terminal steel structures, corrugated steel pipes (plates) for highway culvert passages, rectangular steel pipes, weather-resistant steel pipes, spiral seam submerged arc welded steel pipes, welded steel pipe columns, water-seepage elastic steel pipes, cold-bent hollow rectangular steel pipes for structures, and UV-resistant and anti-corrosion seamless steel pipes.