ASTM A312 TP 304 Stainless Steel Pipe

We produce ASTM A312 TP 304 welded stainless steel pipe in different sizes and dimensions to meet project requirements, pipe sizes and dimensions in NPS range from 1/8 inch to 48 inch, wall thickness in Schedule range from SCH 5 to Sch 160.

ASTM A312 Gr TP304 and UNS S30400 Stainless Steel 304 Welded Pipe manufacturer in China, Annealed and Pickled, Polished, Bright Annealed, Cold Drawn finishes.

ASTM A312 TP 304 stainless steel is the most standard used alloy grade. Essentially, Grade 304 is an austenitic chromium alloy which is also known as an “18/8” stainless as the make-up of the steel is 18% chromium and 8% nickel. ASTM A312 TP304 alloy has excellent resistance against corrosive and oxidative media across stress-induced environments. ASTM A312 TP304 Welded Pipe can be processed via the hot or cold rolling process, sheets or strips are rolled and welded in various welding procedures, like TIG and ERW welding methods. ASTM A312 TP304 Welded Pipes are produced by welding the metal longitudinally to precisely shape the pipes. These pipes are very durable and don’t require any filler material to weld.

Standard	ASTM A312, ASME SA312
Stainless Steel	TP 304, SS 304
Pipe Type	Welded Round Pipe
Finishes	Annealing Pickling, as welded, polished
Outside Diameter	1/8 Inch To 42 Inch 10.3 – 1219 mm DN 6 – DN 1200
Wall Thickness	Sch 5s, Sch 10s, Sch 40s, Sch 80s, Sch 160
Dimensional Specifications	ANSI/ ASME B36.19M, ANSI/ ASME B36.10M
Pipe Ends	Plain end, Beveled end and Treaded End
Application	high-temperature and general corrosive service

ASTM A312 TP 304 Stainless Steel

ASTM A312 TP 304 Stainless Steel is the most used 300 series stainless steel grade, it combines of sufficient Chrome and Nickel contents to possess excellent properties, ASTM A312 TP 304 has good corrosion resistance, good formability and good weldability to meet various applications.

ASTM A312 TP304 stainless steel chemical composition.

Grade	C	Mn	P	S	Si	Ni	Cr	Fe
TP304	0.08	2.00	0.045	0.030	1.0	8-11	18-20	Bal.

ASTM A312 TP304 stainless steel mechanical properties:

	Tensile Strength(Mpa) Max	Yield Point(Mpa) Max	Elongation(%)	Hardness (HRB) Max
TP304	515	205	35	92

ASTM A312 TP 304 Equivalent Grades

GRADE	UNS	EN	JIS	WERKSTOFF NR.	GOST
	USA	EUROPE	JAPAN	GERMAN	RUSSIAN
ASTM A312 TP 304	S30400	X5CrNi18-10	SUS 304	1.4301	08Х18Н10

Type 304L is a lower carbon variant of Grade 304 the steel can be welded without the resulting issue of carbon precipitation, sometime, 304/304L dual grade is required.

ASTM A312 TP304 Welded Stainless Steel Pipe Quality Control

Tolerance: ASTM A312 specification specified outside diameter and wall thickness limitations, OD tolerance conform to ASTM A999.

Outside Diameter

Outside Diameter, NPS	Tolerance, Inch
1/8 To 1-1/2, Incl	Over 1/16 Under 1/32
Over 1-1/2 To 4, Incl	Over 1/32 Under 1/32
Over 4 To 8, Incl	Over 1/16 Under 1/32
Over 8 To 18, Incl	Over 3/32 Under 1/32
Over 18 To 26, Incl	Over 1/8 Under 1/32
Over 26 To 34, Incl	Over 5/32 Under 1/32
Over 34 To 48, Incl	Over 3/16 Under 1/32

Wall Thickness

Outside Diameter	Wall Thickness Tolerance, %
1/8 To 2-1/2 Incl., All T/D Ratios	Over 20.2 Under 12.5
Over 3 To 18 Incl., T/D Up To 5% Incl.	Over 22.5 Under 12.5
Over 3 To 18, Incl., T/D > 5%	Over 15.0 Under 12.5
20 And Large, Welded, All T/D Ratios	Over 17.5 Under 12.5
20 And Large, Seamless, T/D Up To 5% Incl.	Over 22.5 Under 12.5
>20 And Large, Seamless, T/D > 5%	Over 15.0 Under 12.5

Standard Testing And Inspection

Mechanical Tests
Grain Size Determinations
Weld Decay Tests
Transverse or Longitudinal Tension Test
Hydrostatic or Nondestructive Electric Test
Flattening Test (option)
Radiographic Examination (option)
Intergranular Corrosion Test (option)
Weld Decay Test (option)

Dimensions Of ASTM A312 TP304 Stainless Steel Pipe

NPS	DN	OD, mm	SCH 5s	SCH l0s	SCH 10	SCH 20	SCH 30	SCH 40s	SCH STD	SCH 40	SCH 60	SCH 80s	SCH XS	SCH 80	SCH 100	SCH 120	SCH 140	SCH 160	SCH XXS
1/8	6	10.3		1.24				1.73	1.73	1.73		2.41	2.41	2.41
1/4	8	13.7		1.65				2.24	2.24	2.24		3.02	3.02	3.02
3/8	10	17.1		1.65				2.31	2,31	2.31		3.20	3.20	3.20
1/2	15	21.3	1.65	2.11				2.77	2.77	2.77		3.73	3.73	3.73				4.78	7.47
3/4	20	26.7	1.65	2.11				2.87	2.87	2.87		3.91	3.91	3.91				5.56	7.82
1	25	33.4	1.65	2.77				3.38	3.38	3.38		4.55	4.55	4.55				6.35	9.09
1 1/4	32	42.2	1.65	2.77				3.56	3.56	3,56		4.85	4.85	4.85				6.35	9.70
1 1/2	40	48.3	1.65	2.77				3.68	3.68	3.68		5.08	5.08	5.08				7.14	10.15
2	50	60.3	1.65	2.77				3.91	3.91	3.91		5.54	5.54	5.54				8.74	11.07
2 1/2	65	73	2.11	3.05				5.16	5.16	5.16		7.01	7.01	7.01				9.53	14.02
3	80	88.9	2.11	3.05				5.49	5.49	5.49		7.62	7.62	7.62				11.13	15.24
3 1/2	90	101.6	2.11	3.05				5.74	5.74	5.74		8.08	8.08	8.08
4	100	114.3	2.11	3.05				6.02	6.02	6.02		8.56	8.56	8.56		11.13		13.49	17.12
5	125	141.3	2.77	3.40				6.55	6.55	6.55		9.53	9,53	9.53		12.70		15.88	19.05
6	150	168.3	2.77	3.40				7.11	7.11	7.11		10.97	10.97	10.97		14.27		18.26	21.95
8	200	219.1	2.77	3.76		6.35	7.04	8.18	8.18	8.18	10.31	12.70	12.70	12.70	15.09	18.26	20.62	23.01	22.23
10	250	273.1	3.40	4.19		6.35	7.80	9.27	9.27	9.27	12.70	12.70	12.70	15.09	18.26	21.44	25.40	28.58	25.40
12	300	323.9	3.96	4.57		6.35	8.38	9.53	9.53	10.31	14.27	12.70	12.70	17.48	21.44	25.40	28.58	33.32	25.40
14	350	355.6	3.96	4.78	6.35	7.92	9.53		9.53	11.13	15.09		12.70	19.05	23.83	27.79	31.75	35.71
16	400	406.4	4.19	4.78	6.35	7.92	9.53		9.53	12.70	i6.66		12.70	21.44	26.19	30.96	36.53	40.49
18	450	457.2	4.19	4.78	6.35	7.92	11.13		9.53	14.27	19.05		12.70	23.83	29.36	34.93	39,67	45.24
20	500	508	4.78	5.54	6.35	9.53	12.70		9.53	15.09	20.62		12.70	26.19	32.54	38.10	44.45	50.01
22		559	4.78	5.54	6.35	9.53	12.70		9.53		22.23		12.70	28.58	34.93	41.28	47.63	53.98
24	600	610	5.54	6.35	6.35	9.53	14.27		9.53	17.48	24.61		12.70	30.96	38.89	46.02	52.37	59.54
26		660			7.92	12.70			9.53				12.70
28	700	711			7.92	12.70	15.88		9.53				12.70
30		762	6.35	7.92	7.92	12.70	15.88		9.53				12.70
32	800	813			7.92	12.70	15.88		9.53	17.48			12.70
34		884			7.92	12.70	15.88		9.53	17.48			12.70
36	900	914			7.92	12.70	15.88		9.53	19.05			12.70
38		965							9.53				12.70
40	1000	1016						9.53		12.70
42		1067				12.70	15.88		9.53	19.05			12.70
44	1100	1118							9.53				12.70
46		1168							9.53				12.70
48	1200	1219							9.53			12.70
52		1321
56	1422
60	1524

Welded Pipe Manufacturing

Four different welding processes are typically used for making tube. Since there is no filler metal in these welds, the welds are at least as strong as the parent metals.

High Frequency (HF) Welding. Today, most mild steel and aluminum tube is welded with HF welders, which are also suitable for 400 series stainless and even 300 series if the tubing is for decorative use.

Nearly 95 percent of the HF welders sold are solid-state, using transistors to generate the alternating frequency current. Research has been undertaken to weld products less than 1/4 inch in diameter and to extend the ability of the welder to produce a pressure-quality weld on 300 stainless steel at high line speeds.

Compared to other welding techniques, high frequency is somewhat forgiving of less-than-perfect edge registration.

Electric Resistance Welding (ERW). Low-frequency welding, accomplished through a rotating copper electrode, is used most often for mild steel tube from 0.250 to 0.375 inch in diameter.

This process is most suitable for the smallest diameters, as the impeders needed for HF welding cannot fit into the tiny tubes.

Electric resistant weld (ERW) is fabricated from coil. Significant hardness increase due to rapid cooling rate of the ERW seam can be encountered as a result of the fast fabrication process and possible malfunction of the induction heater.

Gas Tungsten Arc Welding (GTAW). GTAW is used for pressure-quality welds on 300 series stainless steel at slower welding speeds. It produces a good weld with little bead.

A welding torch with a tungsten tip, usually employing argon or an argon/oxygen mixture, heats the edges of the strip until the metal begins to melt or puddle, and the next pair of rolls squeezes the strip edges together. Here, edge registration is critical.

Laser Welding. The cost of laser welding is high relative to that of GTAW, although it is faster. It is used primarily for exotic metals and 300 series stainless steel, though some manufacturers use it on 400 series stainless.

Laser welding produces the smallest heat-affected zone (HAZ) and a bead even smaller than that produced by GTAW. Since there is almost no change in the grain structure of the parent metal, the finished piece has greater flexibility than a GTAW part. However, with this technique, edge registration is more critical than with the others.

304 Stainless Steel Pipe

ASME SA312 TP304 SCH 10S Welded Pipes
Sch80s A312 TP304 Stainless Steel SUS 304 Welded Pipes
ASTM A312 Schedule 40S GR- TP304
1.4301 SS 304 Stainless Steel Pipes
UNS S30400 Bright Annealed Pipes
ASTM A312 304 SS Cold Drawn Seamless Pipes
ASTM A312 304 SS Stainless Steel Pipe
SS 304 Hollow Section
Stainless Steel SUS 304 heavy wall Pipes
SS 304 / 1.4301 large diameter stainless steel pipe
ASME SA312 TP304 SS EFW Pipe
UNS S30400 Industry Pipe