Manufacturer, Supplier & Exporter of ASTM A106 Grade C Spool

ASTM A106 Grade C Spool is a high-strength prefabricated piping component designed specifically for high-temperature and high-pressure fluid handling applications. Made from seamless carbon steel with a higher carbon content than Grade A and Grade B, Grade C offers superior tensile and yield strength, making it ideal for demanding industrial operations. Riddhi Siddhi Impex is a leading manufacturer and supplier of ASTM A106 Grade C Spools, producing custom-fabricated spools that ensure excellent dimensional accuracy, weldability, and long-term performance...

As a trusted name in the piping industry, Riddhi Siddhi Impex manufactures ASTM A106 Grade C Pipe Spools using advanced fabrication techniques such as CNC cutting, GTAW/SMAW welding, hydro-testing, and NDT inspection. Each spool is manufactured following ASME, ASTM, and customer-specific requirements. The high mechanical strength of Grade C material makes these spools ideal for boiler lines, steam pipelines, superheater lines, refineries, petrochemical plants, and high-pressure power plant operations.

Riddhi Siddhi Impex is widely recognized as a reliable ASTM A106 Grade C Spool domestic supplier, providing fully customized spools including elbow spools, flanged spools, reducer spools, tee spools, and large-diameter fabricated spools. The company follows strict fabrication tolerances, ensuring each spool assembly fits seamlessly with the client’s piping system, reducing installation time and maintenance requirements...

In metropolitan and industrial cities such as Mumbai, Delhi, Bengaluru (Bangalore), Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, and Rajkot, Riddhi Siddhi Impex maintains a strong distribution network. These regions rely heavily on Grade C spools for critical pipeline projects, power plant upgrades, refinery expansions, and chemical processing units. Quick material availability and consistent quality make the company the preferred supplier for EPC contractors and industrial operators..

Riddhi Siddhi Impex also caters to fast-growing industrial hubs like Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi, Amritsar, Chandigarh, Mysuru (Mysore), Udaipur, Jodhpur, and Visakhapatnam. Industrial plants in these regions require seamless spool assemblies capable of handling extreme temperatures and pressures, making ASTM A106 Grade C the perfect solution. The company’s ability to manufacture spools in both standardized and fully custom configurations adds to its credibility in the Indian market..

ASTM A106 Grade C Spool

Specification

Product Name	ASTM A106 Grade C Spool
Manufacturer	Riddhi Siddhi Impex
Material	Carbon Steel (ASTM A106 Grade C)
Type	Seamless Pipe Spool
Size Range	1/2" NB to 48" NB
Wall Thickness	Sch 10 to XXS
Length	Single Random, Double Random, or Cut Lengths
Application	Oil & Gas, Refineries, Chemical Plants, Power Plants, High Pressure & High Temperature Lines

Chemical Composition (ASTM A106 Grade C)

Element	Content (%)
Carbon (C)	0.30 Max
Manganese (Mn)	0.29 – 1.06
Phosphorus (P)	0.035 Max
Sulfur (S)	0.035 Max
Silicon (Si)	0.10 – 0.35
Copper (Cu)	0.40 Max
Nickel (Ni)	0.40 Max
Chromium (Cr)	0.40 Max

Mechanical Properties

Property	Value
Tensile Strength	415 – 620 MPa
Yield Strength (0.2% Offset)	250 MPa Min
Elongation	20% Min
Hardness	≤ 95 HRB
Impact Strength	Excellent at high temperature

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	A106 Grade C / A53 Grade C
API	5L Grade B / X52
EN	EN 10216 / EN 10224
DIN	St 52.3
BS	3602

Equivalent Standards

Standard	Description
ASTM A106 / A53	Standard Specification for Carbon Steel Pipe for High-Temperature and Pressure Service
API 5L	Specification for Line Pipe
EN 10216-2	Seamless Steel Pipes for Pressure Purposes
DIN 1629 / 2448	Seamless Steel Pipes for Pressure Purposes

Other Types

Type	Description
ASTM A106 Grade A Spool	Lower strength carbon steel spool suitable for moderate pressure applications
ASTM A106 Grade B Spool	Medium strength spool suitable for general industrial applications
PP Coated Carbon Steel Spool	Polypropylene coated spool for corrosion resistance in buried or exposed conditions
3LPE Coated Spool	Three-layer polyethylene coated spool for long-term corrosion protection

Every ASTM A106 Grade C spool supplied by Riddhi Siddhi Impex undergoes quality testing, including radiography, ultrasonic testing, PMI, hydro-testing, and surface inspections. This ensures that each spool assembly meets the stringent standards required for high-pressure and high-temperature piping systems. Their fabrication excellence ensures long service life, leak-free performance, and reliable operation even in the harshest industrial environments..

Frequently Asked Questions (FAQs)

Q1: What are the main applications of ASTM A106 Grade C Spool?

A1: It is used for high-temperature and high-pressure pipelines in oil & gas, refineries, chemical plants, and power plants.

Q2: Can Riddhi Siddhi Impex provide custom spool sizes?

A2: Yes, we manufacture spools in all standard and custom dimensions as per project requirements.

Q3: Is ASTM A106 Grade C suitable for welding?

A3: Yes, Grade C is fully weldable using standard carbon steel welding procedures and maintains high mechanical strength after welding.

Q4: Which Indian cities are served by Riddhi Siddhi Impex for Grade C Spools?

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