Manufacturer, Supplier & Exporter of ASTM A312 TP304L Spool

The ASTM A312 TP304L Spool refers to spool sections fabricated from low-carbon stainless steel grade 304L under the ASTM A312 specification. Grade 304L stainless steel contains similar chromium (around 18‑20%) and nickel (about 8‑12%) as the standard 304, but with a reduced carbon content (< 0.03%). This low carbon reduces the risk of carbide precipitation during welds, making TP304L spools ideal for welded assemblies, long runs, and applications sensitive to intergranular corrosion.

Riddhi Siddhi Impex is a well-established manufacturer, supplier, and stockist of stainless-steel spool assemblies, including the highly demanded ASTM A312 TP304L Spools. Their fabrication facility features modern CNC machines, precision welding, spool assembly lines, and quality‑control labs. This infrastructure ensures that every 304L spool they produce maintains tight dimensional tolerances and meets stringent metallurgical and performance criteria.

One of the major strengths of Riddhi Siddhi Impex lies in its custom spool‑assembly capabilities. Clients can request TP304L spools in a wide variety of dimensions, wall thicknesses, and lengths, tailored to suit specific process piping systems. Additionally, the company offers custom fittings such as elbows, tees, reducers, and flanges. These tailored spool assemblies simplify the installation of complex piping networks, enabling faster construction times and reducing fitting waste on site..

Quality assurance is central to Riddhi Siddhi Impex’s operation. Each ASTM A312 TP304L Spool undergoes a rigorous series of tests, including chemical analysis, mechanical property testing, dimensional checks, and non‑destructive testing (NDT) of welds. Positive Material Identification (PMI) is carried out to confirm alloy composition. The company also provides comprehensive Material Test Certificates (MTCs) in compliance with EN 10204 or equivalent standards, giving clients full traceability and peace of mind..

The low-carbon nature of 304L stainless steel gives the TP304L spool excellent resistance to intergranular corrosion, even after welding or exposure to elevated temperatures. This makes the spool highly reliable for applications such as chemical processing, water pipelines, food and beverage lines, and pharmaceutical manufacturing systems where weld integrity and long-term corrosion resistance are critical. The alloy also offers good mechanical strength, flexibility, and resilience under operational stresses.

ASTM A312 TP304L Spool

Specification

Property	Details
Material	Stainless Steel 304L
Specification	ASTM A312 / ASME SA312
Form	Spool
Surface Finish	Polished / Pickled & Passivated
End Type	Plain End, Beveled End, Threaded
Application	Chemical, Food & Beverage, Pharmaceutical, Water, Oil & Gas

Chemical Composition (Stainless Steel 304L)

Element	Content (%)
Carbon (C)	≤ 0.03
Chromium (Cr)	18–20
Nickel (Ni)	8–12
Manganese (Mn)	≤ 2.0
Phosphorus (P)	≤ 0.045
Sulfur (S)	≤ 0.03
Silicon (Si)	≤ 1.0
Iron (Fe)	Balance

Mechanical Properties

Property	Value
Tensile Strength	≥ 515 MPa
Yield Strength (0.2% Offset)	≥ 205 MPa
Elongation	≥ 40%
Hardness	≤ 95 HRB
Impact Resistance	Excellent

Dimension Chart (Nominal)

Nominal Pipe Size (NB)	Outside Diameter (mm)	Wall Thickness (mm)	Length
1/2"	21.3	2.77	Up to 12 m
1"	33.4	3.38	Up to 12 m
2"	60.3	3.91	Up to 12 m
4"	114.3	6.02	Up to 12 m
6"	168.3	7.11	Up to 12 m
10"	273.1	9.27	Up to 12 m
16"	406.4	12.70	Up to 12 m

Equivalent Grades

Standard	Grade
ASTM	A312 TP304L
EN	1.4306
DIN	X2CrNi18-12
JIS	STS304L
BS	304S11

Equivalent Standards

Standard	Description
ASTM A312	Seamless, Welded, and TP304L Stainless Steel Pipes
ASME SA312	Specification for Stainless Steel Pipes
EN 10216-5	Seamless Stainless Steel Tubes for Pressure Purposes
DIN 17456	Stainless Steel Pipes for General Purposes

Other Types of Stainless Steel Pipes

Type	Description
ASTM A312 TP304 Spool	Standard 304 stainless steel spools
ASTM A312 TP316L Spool	Low carbon 316L stainless steel spools for high corrosion resistance
ASTM A312 TP321 Spool	Stabilized stainless steel spool with titanium addition
ASTM A312 TP347 Spool	Stabilized stainless steel spool with niobium addition

As a leading domestic supplier, Riddhi Siddhi Impex distributes ASTM A312 TP304L spools across a broad network of Indian cities. Their national coverage includes Mumbai, Delhi, Bengaluru (Bangalore), Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Rajkot, Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi, Amritsar, Chandigarh, Mysuru (Mysore), Udaipur, Jodhpur, Visakhapatnam, Coimbatore, Madurai, Kochi, Thiruvananthapuram, Mangalore, Nashik, Kolhapur, Chandrapur, Akola, Vilayat, Somnath, Dahej, Ankleshwar, Navsari, Valsad, Narmada, and Rajpipla. This expansive presence ensures consistent supply and efficient logistics for clients throughout India’s industrial hubs..

Frequently Asked Questions (FAQs)

Q1: What is the difference between TP304 and TP304L?

A1: TP304L has lower carbon content (<0.03%) than TP304, offering better weldability and resistance to intergranular corrosion.

Q2: What applications are ASTM A312 TP304L spools suitable for?

A2: They are widely used in chemical processing, food & beverage, pharmaceutical industries, water pipelines, and oil & gas applications.

Q3: Can Riddhi Siddhi Impex supply customized spool sizes?

A3: Yes, they offer customized spool lengths, diameters, wall thicknesses, and end preparations according to client requirements.

Q4: Do you provide Material Test Certificates (MTCs)?

A4: Yes, MTCs complying with EN 10204 / ASTM standards are provided for all TP304L spools.