ASTM A312 Light Polished Tube Grade 201 202 304 444 316 316L Bright Welded Pipe for Construction Stainless Steel Pipe

This specification covers seamless, straight-seam welded, and heavily cold worked welded austenitic stainless steel pipe intended for high-temperature and general corrosive service. ASTM A312 316L properties and ASTM A312 316L chemical composition are listed in the ASTM A312 specification.

OD: NPS 1/8" to 30"

WT: SCH 5S, 10S, 40S, 80S

Length: 5.8M, 6M, 11.8M, 12M, or any other economical length

Manufacturing Process: Seamless and Welded.

Grade: TP304, TP304L, TP316, TP316L, TP309S, TP310S, TP317, TP317L, TP321, TP347, TP348, 904L

6% Mo (UNS S31254, UNS N08367, UNS N08926), 7% Mo (UNS S32654), 

4% Si (UNS S30600), 5% Si (UNS S30601), 5% Si (UNS S32615), 6% Si (UNS S38815)

a - UNS numbers beginning with an “N” indicate a nickel alloy, but the definition of a nickel alloy is different than that used by ASTM.

b - in ASTM specifications, most nickel alloys fall into the “B” specifications. However, due to a redefinition of a nickel alloy, a few alloys such as 800 and 20 are being reclassified as stainless steels and will be included in the “A” specifications. That work is still in progress.

c - the 6%Mo alloys are a series of stainless steels, many of which are proprietary, all with roughly 6%Mo content and roughly equivalent in performance.

d - the austenitic stainless steels with high Si are proprietary and were developed from nitric acid grades for use in strong sulphuric acid.

The most common grades are TP 304 and TP 316. Grades TP 304H, TP 304N, TP316H, TP316N, TP321H, TP347H and TP348H are modifications of Grades TP 304, TP 316, TP 321.Grades TP 347 and TP 348 and are intended for high-temperature service.

Grades TP304H, TP309H, TP309HCb, TP310H, TP310HCb, TP316H, TP321H, TP347H, and TP348H are modifications of Grades TP304, TP309Cb, TP309S, TP310Cb, TP310S, TP316, TP321, TP347, and TP348, and are intended for service at temperatures where creep and stress rupture properties are important.

These pipes are used in the process, petrochemical, pharmaceutical, and food industries.

Quality Control

The main material including TP304/304L, TP316/316L, TP321, 310S, 904L, S31803, 2520Si2 Monel400 etc, the available specification range are OD: from 3.0mm to 60.33mm, WT: from 0.25mm to 7.0mm. The main production equipment including 102 cold-rolling lines. Three sets of bright annealing furnaces, two sets of polishing machines, 4 sets of Ultrasonic cleaning machine with independent intellectual property rights. Tensile testing equipment, Hardness tester, Roughness tester, Salt spray testig machine, Carbon-sulfur analyzer, Eddy current test, Ultrasonic test, Hydraulic test, Germany import direct reading spectrometer etc. The annual output of more than 5000 tons precision bright annealing tubes, mainly used in Semiconductor industry, Automotive engine, Locomotive brake system, Gas equipment manufacturing, integrated circuits industry, microelectronic equipment, Instrumentation and laboratory etc.