What is ASTM A312 TP 304L pipe chemical composition？

What is ASTM A312 TP 304L pipe ?

ASTM A312 TP 304L is a specification for low-carbon (C ≤ 0.03%) austenitic stainless steel pipe, designed specifically for high-temperature and corrosive service conditions; due to reduced carbide precipitation, this material exhibits excellent weldability. It is widely utilized across various industrial sectors-including chemical processing, food processing, and the oil and gas industry-primarily for the conveyance of liquid and gaseous media.

 

ASTM A312 TP 304L Stainless Steel Pipe Supplier

GNEE is an experienced supplier of boiler and pressure steel pipes, manufacturing and supplying both welded and seamless pipe products that comply with the ASTM A312 standard. We are able to provide you with ASTM A312 steel pipe products covering the full range of grades and dimensions.

 

We employ a precision manufacturing process that combines hot extrusion with cold drawing, supplemented by a solution annealing treatment at 1040–1100°C. This effectively eliminates internal stresses within the tubing and ensures a uniform and consistent material microstructure.

ASTM A312 TP304 stainless steel tubing contains 18.0–20.0% chromium and 8.0–12.0% nickel, featuring an ultra-low carbon content of ≤0.03%. This tubing maintains stable performance within an operating temperature range of -200°C to 450°C, making it fully suitable for long-term, safe operation.
Regarding dimensional accuracy and surface quality, our products feature an outer diameter tolerance controlled within ±0.02–0.4 mm, a wall thickness tolerance within ±10%, and a straightness of ≤0.5 mm/m, fully meeting the requirements for high-precision assembly applications.

Following pickling and passivation treatments, the tubing surface is smooth and clean, with a roughness (Ra) of ≤0.8 μm and no residual scale or impurities. This not only effectively retards the corrosion process but also fully satisfies the sanitary standards required for transport pipelines in the food and pharmaceutical industries.

 

 

ASTM A312 TP 304L Pipe Specification

Specifications	ASTM A312 / SA312
Dimensions	ASTM, ASME
Size	1/8″NB TO 30″NB
Welded Size	1/2" NB - 16" NB
Schedule	SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
Type	ASTM A 312 TP 304 SS Welded Pipes
Specialized in	Large Diameter Size
Length	Single Random, Double Random & Cut Length.
Form	Round, Square, Rectangular, Hydraulic Etc
End	Plain End, Beveled End, Treaded

 

ASTM A312 TP304L Stainless Steel Seamless Pipe Chemical Composition

Grade	UNS	C	Mn	P	S	Si	Cr	Ni
TP304	S30400	0.08 max	2.00 max	0.045 max	0.03 max	1.00 max	18.0-20.0	8.0-11.0
TP304L	S30403	0.035 max	2.00 max	0.045 max	0.03 max	1.00 max	18.0-20.0	8.0-13.0

ASTM A312 TP304L Seamless Pipe Mechanical Properties

Material	Heat Treatment	Temperure Min.ºF(ºC)	Tensile Strength Ksi (MPa), Min.	Yield Strength Ksi (MPa), Min.	Elongation %, Min
TP304	Solution	1900 (1040)	75(515)	30(205)	35
TP304L	Solution	1900 (1040)	70(485)	25(170)	35

 

Calculating Formula for the Value of Mass for Stainless Steel ASTM A312 & Pipe

Grade					Basic Mass (kg/mm m2)			Formula
304TP TP304 304L1TP 304L2TP TP304L					7,93			W=0.02491t(D-t)
316TP TP316 316L1TP 316L2TP TP316L					7,98			W=0.02507t(D-t)

 

ASTM A312 Stainless Steel Pipe Dimension

Materials	Outer Diameter	Wall Thickness	Length	Standard
Austenitic Duplex Steel Nickel Alloy Cobalt Alloy Ferrite	8-711mm DN6-DN700 1/8"-28"	1-50mm Sch5s -SchXXS	≤12m	ASTM-A312 ASTM-A790 ASTM-A269 ASTM-B167/163 ASTM-B444 ASTM-B622 ASTM-B423 ...

 

ASTM A312 Stainless Steel Pipe Tolerances

Item Standard	Outside Diameter			Thickness		Length
ASTM A312	O.D.≤ 48.26mm + 0.40mm - 0.80mm 48.26mm ＜ O.D.≤ 114.3mm ± 0.80mm 114.3mm ＜ O.D.≤ 219.1mm + 1.60mm - 0.80mm 219.1mm ＜ O.D.≤ 457.2mm + 2.40mm - 0.80mm 457.2mm ＜ O.D.≤ 660.4mm + 3.20mm - 0.80mm 660.4mm ＜ O.D.≤ 863.6mm + 4.00mm - 0.80mm 863.6mm ＜ O.D.≤ 1219mm + 4.80mm - 0.80mm			+ 15% '- 12.5%		L≤7.3m +6.0mm - 0mm

 

 

GNEE provides formal Material Test Certificates compliant with EN 10204 3.1 (with 3.2 available as an option), including:
Original mill Heat Number and Batch Number.
Actual test data for chemical composition and mechanical properties.
Description of heat treatment processes (solution annealing temperature and cooling method).
Results of flattening and flaring tests.

Value-added Services
Precision Cutting: CNC saw cutting with length tolerances controlled within ±2mm.
Beveling: Tube end beveling (e.g., 30°, 45°) performed according to specific welding requirements.
Surface Polishing: Internal and external surface polishing services ranging from industrial grade to food and pharmaceutical grades.
Laser Marking: Clear marking on the tube body displaying brand, specifications, standards, material grade, and heat number.

 

Packing & Shipping
GNEE offers:
Dual Protection: Sealed with plastic end caps and individually wrapped in woven bags.
Reinforced Packaging: Enhanced, fumigation-free wooden crates reinforced with steel strapping to prevent deformation during transit.
Logistics Tracking: Partnerships with major shipping lines to provide sea freight, air freight, and China-Europe Railway Express services, with real-time cargo status updates.

FAQ

What is the technical significance of the "L" in TP304L?
The "L" stands for "Low Carbon." The carbon content in TP304L is strictly limited to a maximum of 0.030% (whereas standard TP304 allows up to 0.08%).

 

What is "Dual Certification" 304/304L?
Many manufacturers produce materials that simultaneously meet the high-strength requirements of TP304 and the low-carbon requirements of TP304L. This material is referred to as "304/304L Dual Certified" steel tubing. Possessing both the superior weldability of 304L and the high mechanical strength of 304, it is currently the most common form of supply available on the market.

 

Can TP304L be hardened through heat treatment?
 No. TP304L is an austenitic stainless steel, and its hardness cannot be increased through heat treatment processes (such as quenching). The only method to increase its hardness is through cold working (work hardening)-for example, via cold drawing or cold rolling.