Manufacturer, Supplier & Exporter of Stainless Steel 904L Spool

Stainless Steel 904L Spool is a super‑austenitic, high-alloy stainless steel spool material that combines excellent resistance to corrosion and high strength, thanks to its high nickel, chromium, and copper content. The 904L grade is specifically designed for highly corrosive environments—particularly those with sulfuric acid, seawater, or chloride-rich atmospheres. When used in spool (pipe) form, SS 904L provides outstanding durability, making it ideal for chemical processing plants, offshore systems, and aggressive industrial piping networks where conventional stainless steels might fail prematurely...

Riddhi Siddhi Impex is a leading manufacturer, stockist, and supplier of Stainless Steel 904L Spool in India. With decades of experience in specialty stainless-steel fabrication, the company has built a strong infrastructure that includes precision welding machines, spool‑fabrication workshops, finishing units, and advanced quality control laboratories. Their facility is designed to meet the challenging requirements of 904L, ensuring that every spool produced has the correct alloy composition, weld integrity, and mechanical performance for critical industrial services.

Riddhi Siddhi Impex’s strength lies in its capability to offer customized 904L spool assemblies. Whether customers need specific spool lengths, diameters, wall thicknesses, or unique end connections (flanges, weld ends, threaded ends), the company designs to order. Their engineering team works intimately with clients to understand the chemical, thermal, and mechanical load conditions of the application, and then they fabricate 904L spool sections that are optimized for longevity and performance...

Quality assurance is a cornerstone of Riddhi Siddhi Impex’s operations. Each Stainless Steel 904L Spool undergoes rigorous testing, including Positive Material Identification (PMI), tensile testing, yield strength verification, examination of welds through non-destructive testing (NDT), and hydrostatic or pneumatic pressure testing as required. They also supply detailed Material Test Certificates (MTC) in line with EN 10204 standards, which aids customers in maintaining traceability and compliance with industry requirements..

Stainless Steel 904L Spools are especially valuable in applications where both corrosion resistance and mechanical strength are required. Thanks to its unique alloying, 904L offers superior general corrosion resistance and pitting resistance in chloride-containing environments. It also resists sulfuric and phosphoric acid attack quite well. Consequently, 904L spools are commonly used in chemical plants, acid manufacturing units, seawater cooling systems, desalination plants, and offshore platforms..

Stainless Steel 904L Spool

Specification

Product Name	Stainless Steel 904L Spool
Manufacturer & Supplier	Riddhi Siddhi Impex
Material Grade	SS 904L
Form	Spool / Pipe Assembly
Size Range	1/2" NB to 48" NB (Custom sizes available)
Wall Thickness	Sch 10 to Sch 160 (or XXS)
End Connections	Plain End, Beveled End, Threaded, Flanged
Application	Chemical Plants, Offshore Platforms, Seawater Piping, Acid Handling Plants

Chemical Composition

Element	Content (%)
Carbon (C)	0.02 Max
Chromium (Cr)	19–23
Nickel (Ni)	23–28
Molybdenum (Mo)	4–5
Copper (Cu)	1–2
Manganese (Mn)	2 Max
Silicon (Si)	1 Max
Phosphorus (P)	0.045 Max
Sulfur (S)	0.03 Max

Mechanical Properties

Property	Value
Tensile Strength	≥ 520 MPa
Yield Strength (0.2% offset)	≥ 215 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	Equivalent Grade
ASTM	904L
EN	1.4539
DIN	X1NiCrMoCu25-20-5
JIS	SUS 904L

Equivalent Standards

Standard	Description
ASTM A312 / A312M	Seamless and Welded Austenitic Stainless Steel Pipes
EN 10216-5	Seamless Stainless Steel Tubes for Pressure Purposes
DIN 17457	Austenitic Stainless Steel Pipes for Chemical and Process Industry

Other Types of Stainless Steel Pipes

Type	Description
SS 316L Spool	Corrosion-resistant stainless steel spool for chemical and marine applications
SS 904L Welded Pipe	High-strength, corrosion-resistant welded piping solutions
SS 321 Spool	Heat-resistant stainless steel spool suitable for high-temperature applications
SS 317L Spool	Enhanced corrosion resistance in acidic and industrial environments

As a top Domestic Supplier of Stainless Steel 904L Spool, Riddhi Siddhi Impex provides its products across many key industrial cities in India. Their supply network covers Mumbai, Delhi, Bengaluru (Bangalore), Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Rajkot, Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi, Amritsar, Chandigarh, Mysuru, Udaipur, Jodhpur, Visakhapatnam, Coimbatore, Madurai, Kochi, Thiruvananthapuram, Mangalore, Nashik, Kolhapur, Chandrapur, Akola, Vilayat, Somnath, Dahej, Ankleshwar, Navsari, Valsad, Narmada, and Rajpipla. Their logistical strength ensures timely deliveries to project sites, plants, and maintenance operations everywhere in India..

Frequently Asked Questions (FAQs)

Q1: What are the main applications of SS 904L Spool?

A1: SS 904L Spool is widely used in chemical plants, offshore piping systems, seawater handling, acid processing, and other highly corrosive environments.

Q2: Can Riddhi Siddhi Impex provide custom spool sizes?

A2: Yes, we offer custom lengths, diameters, wall thicknesses, and end connections based on client requirements.

Q3: Is Stainless Steel 904L highly corrosion-resistant?

A3: Yes, 904L offers superior resistance to pitting, crevice corrosion, and general corrosion in chloride-rich and acidic environments.

Q4: Which Indian cities are covered for domestic supply?

A4: We supply SS 904L Spools across Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Rajkot, Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi, Amritsar, Chandigarh, Mysuru, Udaipur, Jodhpur, Visakhapatnam, Coimbatore, Madurai, Kochi, Thiruvananthapuram, Mangalore, Nashik, Kolhapur, Chandrapur, Akola, Vilayat, Somnath, Dahej, Ankleshwar, Navsari, Valsad, Narmada, and Rajpipla.