Manufacturer, Supplier & Exporter of ASTM A312 TP316 Spool

ASTM A312 TP316 Spool refers to spool assemblies made from grade 316 stainless steel under the ASTM A312 specification, designed for high‑corrosion‑resistance applications. 316 stainless steel includes molybdenum (typically 2–3 %) along with chromium and nickel, which gives it superior resistance to pitting and crevice corrosion compared to 304 stainless. In spool form, this material becomes particularly valuable for demanding fluid systems, chemical transport lines, marine environments, and process piping that require both strength and chemical stability..

Riddhi Siddhi Impex is a well-established manufacturer, supplier, and stockist of stainless-steel spool assemblies in India, including ASTM A312 TP316 Spools. Their production facility is equipped with advanced CNC bending machines, high-precision welding setups, spool finishing lines, and rigorous quality-inspection protocols. This infrastructure allows them to produce TP316 spools that meet stringent dimensional and metallurgical specifications, tailored for a wide range of industrial applications..

Customization is one of Riddhi Siddhi Impex’s core strengths. For ASTM A312 TP316 Spools, they offer customer-specific spool assemblies—including pipe diameter, wall thickness, length, bends, elbows, tees, and flanges. Whether the piping network needs a simple straight spool, a complex multidimensional assembly, or pre-fabricated sub-assemblies for quick installation, their engineering team works closely with clients to deliver reliable spool solutions. This level of design customization helps minimize field welding, reduce installation time, and improve system reliability..

Quality control at Riddhi Siddhi Impex is robust and multi-layered. Every TP316 spool undergoes chemical verification (PMI), mechanical property testing (tensile, yield, elongation), and non-destructive testing (NDT) like radiography or ultrasonic inspection for welds. They also do dimensional checks and pressure testing (hydrostatic or pneumatic as needed) to ensure leak-free spools. The company provides Material Test Certificates (MTC) that comply with international standards such as EN 10204 or ASTM norms, ensuring full traceability from raw material to finished spool..

The 316 spool assemblies manufactured by Riddhi Siddhi Impex offer several performance advantages. Molybdenum in 316 gives it enhanced resistance to pitting and crevice corrosion, especially in chloride-laden conditions, such as seawater or chemical brines. This makes TP316 spools highly suitable for offshore piping systems, desalination plants, chemical reactors, and heat exchanger connections. In addition, 316’s good mechanical strength and toughness allow it to operate reliably at elevated temperatures and under cyclic stresses..

ASTM A312 TP316 Spool

Specification

Product Name	ASTM A312 TP316 Spool
Manufacturer	Riddhi Siddhi Impex
Material	Stainless Steel TP316
Standard	ASTM A312 / ASME SA312
Form	Spool with Pipes, Flanges, Elbows, Tees
Surface Finish	Polished / Pickled & Passivated
Size Range	1/2” NB to 24” NB (Custom Sizes Available)
Wall Thickness	Sch 10 to Sch 160
Length	Single Random, Double Random, or Cut Lengths
Applications	Chemical, Marine, Oil & Gas, Process Industries

Chemical Composition (%)

Element	Min	Max
Carbon (C)	0	0.08
Chromium (Cr)	16	18
Nickel (Ni)	10	14
Molybdenum (Mo)	2	3
Manganese (Mn)	0	2
Silicon (Si)	0	0.75
Phosphorus (P)	0	0.045
Sulfur (S)	0	0.03

Mechanical Properties

Property	Value
Tensile Strength	515–720 MPa
Yield Strength	205 MPa min
Elongation	40% min
Hardness	≤ 95 HRB
Operating Temperature	Up to 870°C (intermittent)

Dimension Chart (Nominal)

Nominal Pipe Size (NB)	Outside Diameter (mm)	Wall Thickness (mm)	Length
1/2"	21.3	2.77–4.55	Up to 12 m
1"	33.4	2.77–6.02	Up to 12 m
2"	60.3	2.87–6.02	Up to 12 m
4"	114.3	3.68–7.11	Up to 12 m
6"	168.3	4.78–8.18	Up to 12 m

Equivalent Grades

Standard	Grade
ASTM	TP316
EN	X5CrNiMo17-12-2
JIS	SUS316
GB/T	06Cr17Ni12Mo2

Equivalent Standards

Standard	Description
ASTM A312	Seamless and welded austenitic stainless steel pipe
ASME SA312	Specification for stainless steel pipe used in pressure and high temperature applications

Other Types of Stainless Steel Spools

Type	Description
TP304 / 304L	General purpose stainless steel spool with corrosion resistance
TP316L	Low carbon variant of 316 for welding applications
904L	Super austenitic stainless steel with high corrosion resistance
Duplex / Super Duplex	High strength and corrosion resistance for aggressive environments

As a Domestic Supplier of ASTM A312 TP316 Spools, Riddhi Siddhi Impex has developed an extensive distribution network across key Indian cities. Their domestic outreach 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 wide presence ensures seamless spool delivery to project sites and maintenance facilities across industrial India..

Frequently Asked Questions (FAQs)

Q1: What are the common applications of ASTM A312 TP316 Spool?

A1: ASTM A312 TP316 Spool is widely used in chemical processing, marine environments, oil & gas pipelines, food processing equipment, and pharmaceutical industries due to its excellent corrosion resistance and durability.

Q2: Can Riddhi Siddhi Impex supply custom sizes for TP316 Spools?

A2: Yes, Riddhi Siddhi Impex provides TP316 spools in custom lengths, diameters, wall thicknesses, and end preparations to meet specific project requirements across Indian cities.

Q3: Is ASTM A312 TP316 Spool suitable for high-temperature applications?

A3: Yes, TP316 stainless steel can withstand high temperatures up to 870°C intermittently, making it suitable for heat exchangers, industrial boilers, and high-temperature chemical processes.

Q4: Which domestic cities are served by Riddhi Siddhi Impex for TP316 spools?

A4: Riddhi Siddhi Impex supplies TP316 spools across major Indian cities including Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, and more.