ASTM A778 Pipes – Manufacturer

Midland Alloys Inc., a reputable Indian manufacturer, and global supplier of ASTM A778 Pipe which offer stainless steel welded pipes, that are designed to withstand corrosion resistance and long-term durability. Manufactured to meet the stringent requirements of ASTM A778, these pipes are suitable for low, and moderate temperature use in food processing industries, pharmaceutical industries and wastewater treatment industries. ASTM A778 covers welded, unannealed austenitic stainless steel pipes intended for low-pressure use, where corrosion resistance is key and mechanical properties are adequate without post-weld heat treatment. These pipes ensure both structural integrity and chemical effectiveness by maintaining precise measurements in diameter and wall thickness and adhering to strict specifications in mechanical properties such as tensile strength, elongation, and area reduction.

Benefits of ASTM A778 Pipe

ASTM A778 Pipes offer a strong blend of performance, cost-efficiency, and fabrication flexibility. Their design supports a wide range of industrial needs with ease of welding, forming and long-term use in corrosive environments.

Outstanding resistance to corrosion in conditions that are oxidizing, and moderately reducing environments
Unannealed manufacturing results in lower material and production costs.
Perfect for applications requiring low to moderate pressure and temperature
Smooth interior surfaces to increase the effectiveness of flow
Simple to construct, weld and install in prefabricated systems or on-site
Ideal for usage in moist, humid, or sanitary environments
Reliable mechanical performance without the requirement for heat treatment after welding

Difference between ASTM A358 and A778 pipes

The production process, and intended service conditions are the main areas where ASTM A778 and ASTM A358 pipes differ from one another. ASTM A778 specifies welded unannealed austenitic stainless steel pipes produced by automatic welding without filler metal and without subsequent heat treatment. These pipes work well in situations, where resistance to corrosion is more important than strength, usually at lower pressures. On the other hand, ASTM A358 deals with austenitic stainless steel pipe, that has been electric-fusion welded, frequently with filler metal, and typically subjected to heat treatment. It is compatible with more demanding service conditions, and systems under higher pressure. While ASTM A778 pipes provide cost-effective performance in standard industrial applications, ASTM A358 pipes typically have superior mechanical qualities due to post-weld treatment, which makes them appropriate for harsh corrosive, or thermal applications.

Technical Specifications of ASTM A778 Pipe

Types of ASTM A778 Pipe

Manufacturing Types

Seamless Pipe

Weld-free, perfect for even strength and sizing precision.
Welded Pipe

Welded from flat-rolled steel, widely used where economy and large sizes are required.
ERW Pipe

Electric Resistance Welded (ERW) pipes provide neat, high quality weld seams and are ideal for medium-pressure applications.
EFW Pipe

Electric Fusion Welded (EFW) pipes are welded by fusion welding, usually applied in larger diameters and high-demand processes.
LSAW

Longitudinal Submerged Arc Welded (LSAW) pipes provide straight seam welding which is favored for thick-wall pieces and structural requirements.

Pipe Forms

Round Pipe

The most common shape for fluid and gas transport.
Square Pipe

Used in architectural and structural applications requiring angular profiles.
Rectangular Pipe

Provides greater strength in load-bearing regions and flat structures.
Hydraulic Pipe

Designed to provide precise dimensional control for fluid systems under pressure.

Contact Midland Alloys Inc. for Your ASTM A778 Pipe Needs

Contact us today to discuss how ASTM A778 Pipe can benefit your application. Whether you need guidance in selecting the right pipes or have specific requirements, our team of experts is here to help you find the optimal solution.

Technical Details & Delivery Condition

Chemical Composition of ASTM A778 Pipe

Grade	C	Mn	P	S	Si	Cr	Ni	Mo
304	0.08	2	0.045	0.03	1	18.0 – 20.0	8.0 – 11.0	–
304L	0.035	2	0.045	0.03	1	18.0 – 20.0	8.0 – 13.0	–
316	0.08	2	0.045	0.03	1	16.0 – 18.0	11.0 – 14.0	2.0 – 3.0
316L	0.035	2	0.045	0.03	1	16.0 – 18.0	10.0 – 14.0	2.0 – 3.0

Mechanical Property of ASTM A778 Pipe

Material	Yield Strength Ksi (MPa), Min.	Temperature Min. °F (°C)	Tensile Strength Ksi (MPa), Min.	Heat Treatment	Elongation
304	30(205)	1900 (1040)	75(515)	Solution	35
304L	25(170)	1900 (1040)	70(485)	Solution	35
316	30(205)	1900 (1040)	75(515)	Solution	35
316L	25(170)	1900 (1040)	70(485)	Solution	35

Equivalent Grades of ASTM A778 Pipe

STANDARD	WERKSTOFF NR.	AFNOR	UNS	BS	JIS	GOST	EN
SS 304	1.4301	Z7CN18-09	S30400	304S31	SUS 304	08X18H10	X5CrNi18-10
SS 304L	1.4306 / 1.4307	Z3CN18-10	S30403	3304S11	SUS 304L	03X18H11	X2CrNi18-9 / X2CrNi19-11
SS 316	1.4401 / 1.4436	Z7CND17-11-02	S31600	316S31 / 316S33	SUS 316	–	X5CrNiMo17-12-2 / X3CrNiMo17-13-3
SS 316L	1.4404 / 1.4435	Z3CND17-11-02 / Z3CND18-14-03	S31603	316S11 / 316S13	SUS 316L	03Ch17N14M3 /03Ch17N14M2	X2CrNiMo17-12-2 /X2CrNiMo18-14-3

Stainless Steel Pipe Grades We Also Offer

Stainless Steel 304/304L Pipes

Stainless Steel 310/310S Pipes

Stainless Steel 316/316L Pipes

Stainless Steel 316Ti Pipes

Stainless Steel 317/317L Pipes

Stainless Steel 321/321H Pipes

Stainless Steel 347/347H Pipes

Stainless Steel 904L Pipes

Stainless Steel 253MA Pipes

SMO 254 Pipes

ASTM A358 PIPES

ASTM A778 PIPES

Pipe Dimensions

Thickness Chart

Pipe Dimensions

Thickness Chart

How ASTM A778 Pipe Are Manufactured

Round Bar

Analytic

Cut to Length

Centering

Heating

Perforation

Inspection of Size

Pickling

Inspection of Surface

Lubricating

Cold Drawing (Cold Rolling)

Degreasing

Annealing

Straightening

Cut

Pickling / Passivating

Inspection

Analytic

Marking

Packing & Shipping

Applications of ASTM A778 Pipe

ASTM A778 Pipes are widely used in industries that require corrosion-resistant and hygienic piping solutions without the high cost of annealed or seamless options. These pipes are utilized in cleaning systems, and process water systems within the food and beverage industries, where corrosion resistance, and standards of hygiene are required. To ensure product safety, pharmaceutical industries utilize ASTM A778 stainless steel tubing to transport non-reactive fluids, and purified water. They work with mildly corrosive fluids at lower pressures in the chemical and petrochemical industries. Municipal water treatment facilities use these pipes for drainage, waste lines and non-pressure carrying applications. They are also suitable for structural, and architectural uses, especially where visual finish and basic corrosion resistance are required. Due to their easy fabrication, they integrate well into HVAC, light-duty process pipelines, and fire sprinkler systems.

Offshore Industry

Nuclear Industries

Refineries

Ship Building

Aerospace

Pharmaceutical

Why Choose ASTM A778 Pipe from Midland Alloys Inc.

Midland Alloys Inc. is a leading Indian manufacturer and exporter of high-quality ASTM A778 tp304l and ASTM A778 tp316l stainless steel welded pipes. Being an ISO certified company, we are expert in providing astm a778 stainless steel pipe according to precise dimensions, finish, and grade requirements. We follow complete adherence to ASTM A778 specifications, supported by thorough in-house testing, mill test certificates (MTCs), and third-party inspection as and when necessary. Our production line accommodates customized options such as cut-to-size pipes, plain or beveled end finish, special surface treatments, and unique wall thickness schedules. We supply to customers in the Gulf, Europe, Southeast Asia and Africa with timely dispatch, accurate packaging, and worldwide logistics coordination. To ensure traceability and quality assurance, all ASTM A778 stainless steel welded pipes are marked in accordance with ASTM/ASME requirements and provide comprehensive documentation. With strong project management support and experienced export handling, we offer long-term supply partnerships built on trust, performance, and customer satisfaction.

FAQ - ASTM A778 Pipe

What is the cost range of ASTM A778 Pipe in India or international markets?

The price of ASTM A778 Pipe depends on factors such as grade (e.g., ASTM A778 tp304l, or ASTM A778 tp316l), size, wall thickness, quantity and customization.

How does the ease of fabrication of ASTM A778 differ from ASTM A312?

Relative to ASTM A312, ASTM A778 provides simpler and less expensive fabrication, as it does not require post-weld annealing, due to its suitability for less critical applications.

Is ASTM A778 Pipe suitable for drinking water systems?

Yes, ASTM A778 stainless steel pipe made from grades like 304L, or 316L is safe for use in potable water systems, especially where hygiene and corrosion resistance are needed.

Products Categories

ISO Certificate

Stainless Steel OD mm	Pipe WT mm	in.	Sch	Kg/m
13.72	1.65	1/4	10S	0.50
13.72	2.24	1/4	40S	0.64
13.72	3.02	1/4	80S	0.81
17.15	1.65	3/8	10S	0.64
17.15	2.31	3/8	40S	0.86
17.15	3.20	3/8	80S	1.12
21.34	2.11	1/2	10S	1.02
21.34	2.77	1/2	40S	1.29
21.34	3.73	1/2	80S	1.65
26.67	2.11	3/4	10S	1.30
26.67	2.87	3/4	40S	1.71
26.67	3.91	3/4	80S	2.23
33.40	2.77	1	10S	2.13
33.40	3.38	1	40S	2.54
33.40	4.55	1	80S	3.29
33.40	6.35	1	160	4.30
42.16	2.77	1¼	10S	2.73
42.16	3.56	1¼	40S	3.44
42.16	4.85	1¼	80S	4.53
42.16	6.35	1¼	160	5.69
48.26	2.77	1½	10S	3.16
48.26	3.68	1½	40S	4.11
48.26	5.08	1½	80S	5.49
60.33	2.77	2	10S	3.99
60.33	3.91	2	40S	5.52
60.33	5.54	2	80S	7.60
60.33	8.74	2	160	11.29
73.03	3.05	2½	10S	5.35
73.03	5.16	2½	40S	8.77
73.03	7.01	2½	80S	11.59
88.90	3.05	3	10S	6.56
88.90	5.49	3	40S	11.47
88.90	7.62	3	80S	15.51
88.90	11.13	3	160	21.67
101.60	3.05	3½	10S	7.53
101.60	5.74	3½	40S	13.78
101.60	8.08	3½	80S	18.92
114.30	3.05	4	10S	8.50
114.30	6.02	4	40S	16.32
114.30	8.56	4	80S	22.67
114.30	13.49	4	160	34.05
141.30	6.55	5	40S	22.10
141.30	9.53	5	80S	31.44
141.30	15.88	5	160	49.87
168.28	3.40	6	10S	14.04
168.28	7.11	6	40S	28.69
168.28	10.97	6	80S	43.21
168.28	14.27	6	120	54.75
168.28	18.26	6	160	68.59
219.08	8.18	8	40S	43.20
219.08	12.70	8	80S	65.63
219.08	18.23	8	120	91.30
219.08	23.01	8	160	112.97

Nominal size [inches]	Outside diameter [inches]	Outside diameter [mm]	Wall thickness [inches]	Wall thickness [mm]	Weight [lb/ft]	Weight [kg/m]
1/8	0.405	10.3	0.095	2.41	0.31	0.47
1/4	0.54	13.7	0.119	3.02	0.54	0.8
1/2	0.84	21.3	0.147	3.73	1.09	1.62
3/4	1.05	26.7	0.154	3.91	1.47	2.2
1	1.315	33.4	0.179	4.55	2.17	3.24
1 1/4	1.66	42.2	0.191	4.85	3	4.47
1 1/2	1.9	48.3	0.2	5.08	3.63	5.41
2	2.375	60.3	0.218	5.54	5.02	7.48
2 1/2	2.875	73	0.276	7.01	7.66	11.41
3	3.5	88.9	0.3	7.62	10.25	15.27
3 1/2	4	101.6	0.318	8.08	12.5	18.63
4	4.5	114.3	0.337	8.56	14.98	22.32
5	5.563	141.3	0.375	9.53	20.78	30.97
6	6.625	168.3	0.432	10.97	28.57	42.56
8	8.625	219.1	0.5	12.7	43.39	64.64
10	10.75	273	0.594	15.09	64.43	96.01
12	12.75	323.8	0.688	17.48	88.63	132.08
14	14	355.6	0.75	19.05	106.13	158.1
16	16	406.4	0.844	21.44	136.61	203.53
18	18	457	0.938	23.83	170.92	254.55
20	20	508	1.031	26.19	208.87	311.17
24	24	610	1.125	30.96	296.58	442.08