Manufacturer, Supplier & Exporter of ASTM A312 TP316L Spool

ASTM A312 TP316L Spool refers to pre-fabricated spool assemblies made from low-carbon 316L stainless steel, in compliance with the ASTM A312 specification. The “L” in 316L stands for low carbon, typically less than 0.03%, which significantly reduces the risk of carbide precipitation during welding and prevents intergranular corrosion. This grade is particularly useful for welded piping systems, especially in applications where corrosion resistance and cleanliness are critical, such as chemical, pharmaceutical, and food-processing industries..

Riddhi Siddhi Impex is a reputed manufacturer and stockist of stainless steel products in India, and specializes in producing ASTM A312 TP316L Spool assemblies. Their manufacturing infrastructure includes advanced CNC spool fabrication equipment, precision welding machines, and dedicated finishing units. This ensures that the TP316L spools meet tight dimensional tolerances, have strong weld integrity, and are resistant to environmental and process-related stresses.

Customization is one of the flagship capabilities of Riddhi Siddhi Impex. They deliver TP316L spool assemblies tailor-made to project needs: spool lengths, diameters, wall thicknesses, elbows, tees, reducers, and flanged or beveled ends can all be fabricated as per the customer’s specifications. Such tailor-made spool assemblies reduce field welding, minimize installation labor, and ensure better flow efficiency. The design flexibility also helps in reducing lead times and raising the quality of the overall piping network...

Quality assurance at Riddhi Siddhi Impex is rigorous. Each TP316L spool undergoes comprehensive inspections, including dimensional checks, Positive Material Identification (PMI) to validate chemistry, non-destructive testing (NDT) of welds (such as radiography or ultrasonic testing), pressure testing, and surface finish verification. The company issues Material Test Certificates (MTCs) in accordance with EN 10204 or equivalent standards, giving clients complete traceability from raw material to finished spool...

The 316L stainless steel used in these spool assemblies provides excellent corrosion resistance, especially against chlorides, acids, and many aggressive industrial environments. The molybdenum content in 316L (usually 2–3%) improves pitting resistance, making TP316L ideal for chemical processing, marine applications, desalination plants, and offshore piping systems. The low carbon content also makes it highly weldable, with minimal risk of sensitization, thus extending the lifespan of the spool.

ASTM A312 TP316L Spool

Specification

Product Name	ASTM A312 TP316L Spool
Manufacturer	Riddhi Siddhi Impex
Material	Stainless Steel 316L (Low Carbon)
Standard	ASTM A312 / ASME SA312
Form	Spool Assemblies: Elbows, Tees, Reducers, Flanges, Welded Spools
Size Range	1/2" NB to 48" NB (customizable)
Wall Thickness	Sch 10 to Sch 160 / XXS
Surface Finish	2B, BA, No.4, Mirror Finish
Applications	Chemical, Petrochemical, Pharmaceutical, Marine, Food & Beverage Industries

Chemical Composition

Element	Content (%)
Carbon (C)	0.03 Max
Manganese (Mn)	2.0 Max
Phosphorus (P)	0.045 Max
Sulfur (S)	0.03 Max
Silicon (Si)	0.75 Max
Chromium (Cr)	16.0 – 18.0
Nickel (Ni)	10.0 – 14.0
Molybdenum (Mo)	2.0 – 3.0
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

Dimension Chart (Nominal)

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

Equivalent Grades

Standard	Grade
ASTM	316L
EN	1.4404 / X2CrNiMo17-12-2
JIS	SUS316L
DIN	1.4404

Equivalent Standards

Standard	Description
ASTM A312 / ASME SA312	Seamless and Welded Austenitic Stainless Steel Pipes
EN 10216-5	Seamless Stainless Steel Tubes for Pressure Purposes
JIS G3459	Stainless Steel Pipes for High Temperature/Pressure

Other Types

Type	Description
TP304 / TP304L Spool	General-purpose austenitic stainless steel spool assemblies
TP316 / TP316L Spool	High corrosion-resistant stainless steel spool assemblies
TP321 / TP321H Spool	Stainless steel with titanium stabilization for high-temperature service
Duplex / Super Duplex Spool	High-strength corrosion-resistant stainless steel spools for aggressive environments

As a Domestic Supplier of ASTM A312 TP316L Spool, Riddhi Siddhi Impex distributes its spool assemblies across an extensive network in India. Their 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 robust domestic reach ensures that industries across India have easy access to high-grade 316L spool assemblies.

Frequently Asked Questions (FAQs)

Q1: What are the common applications of ASTM A312 TP316L Spool?

A1: TP316L spools are widely used in chemical, pharmaceutical, petrochemical, food & beverage, and marine piping systems.

Q2: Can Riddhi Siddhi Impex provide custom sizes?

A2: Yes, the company provides fully customized spool assemblies including different diameters, wall thicknesses, and flange options as per project requirements.

Q3: What makes TP316L better than TP316?

A3: TP316L has lower carbon content, which reduces the risk of intergranular corrosion during welding, making it ideal for welded piping systems.

Q4: Which Indian cities can I order TP316L spools from Riddhi Siddhi Impex?

A4: Spools are supplied across Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Rajkot, Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi, Amritsar, Chandigarh, Mysuru, and many more domestic cities.