Manufacturer, Supplier & Exporter of ASTM A312 TP304 Spool

ASTM A312 TP304 Spool refers to spool assemblies made from stainless steel grade 304, manufactured to the ASTM A312 specification for seamless and welded piping. 304 stainless steel is an austenitic alloy containing chromium and nickel, offering excellent corrosion resistance, good weldability, and adequate mechanical strength. When shaped into spools (pre‑fabricated pipe sections), this material becomes very useful in a wide variety of industrial applications, such as chemical plants, food processing units, pharmaceutical systems, and HVAC installations, where long, reliable pipe runs are needed..

One of the core advantages offered by Riddhi Siddhi Impex is custom fabrication of TP304 spool assemblies. They can tailor the spool size, wall thickness, length, bends, and end connections (flanged, beveled, welded) based on client specifications. Their engineering team works closely with clients — including EPC contractors, industrial fabricators, and plant maintenance teams — to design spool assemblies that not only meet fluid‑flow and pressure requirements but also align with installation layouts and thermal expansion needs..

ASTM A312 TP304 Spool is a high-quality stainless steel spool made from 304 stainless steel, conforming to ASTM A312 standards for seamless and welded piping. 304 stainless steel is an austenitic alloy containing chromium (18–20%) and nickel (8–10.5%), providing excellent corrosion resistance, high durability, and superior formability. TP304 spools are widely used in chemical, pharmaceutical, food processing, and industrial piping applications where reliable, pre-fabricated piping assemblies are required for ease of installation and maintenance...

Riddhi Siddhi Impex is a leading manufacturer and supplier of stainless steel products in India, specializing in spool assemblies including ASTM A312 TP304 spools. With decades of experience in stainless steel fabrication, the company ensures that each spool meets stringent quality standards. Their expertise allows them to deliver spools in customized sizes, wall thicknesses, and lengths with precise end preparations such as beveled, plain, or flanged ends for smooth integration into piping systems..

One of the key advantages of ASTM A312 TP304 Spools from Riddhi Siddhi Impex is their custom fabrication capability. The company offers spools in various dimensions to match project requirements, including welded, seamless, or ERW configurations. Clients can request specialized assemblies with elbows, tees, reducers, and other fittings, enabling the creation of complex piping systems with reduced installation time and improved operational efficiency..

ASTM A312 TP304 Spool

Specification

Product Name	ASTM A312 TP304 Spool
Manufacturer	Riddhi Siddhi Impex
Material	Stainless Steel 304 (Austenitic)
Standard	ASTM A312
Form	Spool (Seamless/Welded)
End Connection	Beveled, Plain, Flanged
Application	Chemical, Pharmaceutical, Food Processing, Industrial Piping
Size Range	1/2" NB to 48" NB (Custom Sizes Available)
Wall Thickness	Schedule 10S to Schedule 160S / Custom
Length	As per project requirement (Random, Cut Length)

Chemical Composition

Element	Content (%)
Carbon (C)	0.08 Max
Manganese (Mn)	2.00 Max
Phosphorus (P)	0.045 Max
Sulfur (S)	0.03 Max
Silicon (Si)	1.00 Max
Chromium (Cr)	18–20
Nickel (Ni)	8–10.5
Nitrogen (N)	0.10 Max

Mechanical Properties

Property	Value
Tensile Strength	515 MPa Min
Yield Strength (0.2% offset)	205 MPa Min
Elongation	40% Min
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	TP304 / TP304L
EN	1.4301 / 1.4307
DIN	X5CrNi18-10
JIS	SU304 / SUS304L

Equivalent Standards

Standard	Description
ASTM A312	Seamless and Welded Stainless Steel Pipe
EN 10216-5	Seamless Stainless Steel Tubes for Pressure Purposes
DIN 17456 / 17457	Stainless Steel Pipes for General Applications
JIS G3459	Stainless Steel Pipes

Other Types of Stainless Steel Spools

Type	Description
ASTM A312 TP316 Spool	Higher corrosion resistance with molybdenum for chemical and marine applications
ASTM A312 TP304L Spool	Low carbon variant for better weldability and intergranular corrosion resistance
ASTM A312 TP321 Spool	Stabilized stainless steel for high-temperature environments
ASTM A312 TP316L Spool	Low carbon 316 grade suitable for highly corrosive environments

Riddhi Siddhi Impex emphasizes quality assurance and testing for every spool they manufacture. Each ASTM A312 TP304 spool undergoes strict inspections, including dimensional checks, non-destructive testing (NDT), and weld integrity tests. Positive Material Identification (PMI) and material test certificates (MTCs) are provided to verify chemical composition, ensuring compliance with ASTM standards. This rigorous approach guarantees long-lasting performance even in demanding environments..

Q1: What are the main applications of ASTM A312 TP304 Spool?

A1: It is widely used in chemical, pharmaceutical, food processing, and industrial piping systems due to its excellent corrosion resistance and mechanical properties.

Q2: Can Riddhi Siddhi Impex provide custom sizes and lengths?

A2: Yes, they offer custom spool sizes, wall thicknesses, and lengths to suit specific project requirements.

Q3: Is ASTM A312 TP304 suitable for high-temperature applications?

A3: Yes, 304 stainless steel spools can withstand temperatures up to 870°C (1600°F) in intermittent service.

Q4: Which domestic cities in India are covered for supply?

A4: Major cities like Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, and many more across India.