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KCM Special Steel

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Top 87 Long-Term Client · China

Duplex + super-duplex stainless steel pipes/fittings/flanges manufacturer — ISO 9001:2015, DNV GL-ST-F101 (3,000m subsea), 20+ global standards.

KCM Special Steel Co., Ltd. — duplex and stainless steel pipe suppliers, fittings/flanges manufacturer in China. Specialty: seamless and welded duplex / super duplex stainless steel pipes, fittings, flanges. Major grades: UNS S31803 / S32205 (SAF 2205), UNS S32750 (SAF 2507) / 1.4410 / F53, UNS S32760, UNS S32304 / SAF 2304. Large stock for urgent projects + custom alloys, sizes, finishes. Complia

View 10 products → Contact supplier →
ISO 9001:2015
Zero non-conformities
DNV GL-ST-F101
3,000m subsea
20+
Global standards
120km
Subsea project
01 / Company

About KCM Special Steel.

KCM Special Steel Co., Ltd. — duplex and stainless steel pipe suppliers, fittings/flanges manufacturer in China. Specialty: seamless and welded duplex / super duplex stainless steel pipes, fittings, flanges. Major grades: UNS S31803 / S32205 (SAF 2205), UNS S32750 (SAF 2507) / 1.4410 / F53, UNS S32760, UNS S32304 / SAF 2304. Large stock for urgent projects + custom alloys, sizes, finishes. Compliance: ASTM A312/A213/A269/A790/A789/A815/A928, JIS G3463, DIN 17456, GB 13296, plus 20+ global standards. Certifications: ISO 9001:2015 (Zero non-conformities last 4 audits), DNV GL-ST-F101 (Approved for 3,000m subsea depth). Notable projects: 120km of 24-inch super duplex pipes for high-pressure gas transmission (-2°C seabed + H2S contamination — 0% hydrogen-induced cracking after 18-month monitoring); Brazil Libra Oil Field FPSO (2024) — 3,500 tons S32760 hyper duplex pipes for seawater cooling, custom 6Mo alloy reduced cleaning cycles 60%; BASF Antwerp Ethylene Cracker (2025) — 8,000+ precision tubing components 6mm-300mm OD with EN 10217-7 compliance, enabling 10% higher thermal efficiency vs traditional 316L. Advanced cold-drawing + heat treatment processes eliminate weld seams, reducing weak points 98% vs welded. Post-production hardness testing (HRC 28-32), ferrite-austenite phase balance (45-55% ferrite). Serves oil & gas, chemical, energy sectors worldwide.

Applications: Offshore oil & gas (subsea pipelines, FPSO seawater systems) · chemical processing (ethylene crackers, BASF-grade tubing) · marine engineering (ship building, seawater cooling) · pulp + paper · water treatment + desalination · energy sector (LNG, geothermal) · petrochemical refineries · pharmaceutical / biotechnology process piping · acidic wastewater systems · global EPC contractors.

BrandKCM Special Steel
CompanyKCM Special Steel Co., Ltd.
Domainduplexstainlesssteelpipes.com
LocationChina
Address(see duplexstainlesssteelpipes.com/contact)
Email(see duplexstainlesssteelpipes.com/contact)
Phone(see duplexstainlesssteelpipes.com/contact)
02 / Products

10 products from KCM Special Steel.

Real product names, models, and specs as listed on https://www.duplexstainlesssteelpipes.com/. Image hotlinks point back to the supplier's own site.

01

Duplex 2205 Stainless Steel Pipe (UNS S32205 / S31803 · SAF 2205)

2205 / S32205
ASTM A789 + A790 + A928 · 21% Cr · 2.5% N · 4.5% Mo-Ni · double yield vs austenitic

Duplex 2205 Stainless Steel Pipe (SAF 2205 / UNS S32205 / S31803) — ferrite + austenite combination. 21% chromium, 2.5% nitrogen, 4.5% molybdenum nickel alloy. Double the yield strength of austenitic stainless steel — designers can lose weight on products. Better than 316/317L. High chrome + Mo content excellent for spot + uniform corrosion resistance. Widely used in oil and gas, marine engineering, chemical industry.

02

Super Duplex 2507 Stainless Steel Pipe (UNS S32750 / SAF 2507 / 1.4410 / F53)

2507 / S32750
ASTM A789 + A790 + A815 · 25% Cr · 7% Ni · PREN > 40

Super Duplex 2507 Stainless Steel Pipe (SAF 2507 / UNS S32750 / 1.4410 / F53) — most common widely-recognized super duplex grade. High strength + corrosion resistance. PREN value > 40. Used in chemical processes, oil and gas, marine environments.

03

Super Duplex Pipe UNS S32760 (Zeron 100 type) — Hyper Duplex

S32760
Tungsten + copper added · PREN ≥ 40 · seawater cooling

UNS S32760 Pipe — addition of tungsten and copper makes UNS S32760 more resistant to corrosion than S32750. PREN ≥ 40. Used in Brazil Libra Oil Field FPSO project: 3,500 tons of S32760 hyper duplex pipes for seawater cooling systems with custom 6Mo alloy add-ons reducing cleaning cycles by 60%.

04

Lean Duplex Pipe UNS S32304 (SAF 2304)

S32304 / SAF 2304
Lean austenitic-ferritic duplex · ~316 corrosion · double yield

Lean Duplex Pipe (UNS S32304 / SAF 2304) — lean austenitic-ferritic duplex stainless steel with general corrosion resistance similar to 316, but with yield strength nearly double that of austenitic stainless steel.

05

Duplex Stainless Steel Pipe Fittings (Butt-Weld)

DSS fittings
ASTM A815 · butt-weld · 2205 / 2507 / 2304

Duplex Stainless Steel Pipe Fittings — ASTM A815 UNS S31803 (S32205) butt-weld fittings, ASTM A815 UNS S32750 (2507 / 1.4410 / F53) fittings. Includes elbows, tees, reducers, caps in duplex grades.

06

Duplex Stainless Steel Flanges

DSS flanges
Duplex flanges in 2205 / 2507 / 2760

Duplex Stainless Steel Flanges — flanges in all duplex grades.

07

Welded Duplex Pipe (ASTM A928 EFW)

A928 EFW
ASTM A928 EFW · S31803 / S32205 / S32750

Welded Duplex Pipe — ASTM A928 EFW (Electric Fusion Welded) pipe in S31803/S32205 (Duplex 2205) and S32750 (Super Duplex 2507). Automated welding for consistent weld quality.

08

Seamless Duplex Pipe (ASTM A790)

A790 seamless
ASTM A790 seamless · 98% weak-point reduction

Seamless Duplex Pipe — manufactured under ASTM A790 standards. Advanced cold-drawing + heat treatment processes eliminate weld seams, reducing weak points by 98% compared to welded alternatives. Hardness HRC 28-32, ferrite-austenite balance 45-55% ferrite.

09

Precision Duplex Tubing (6mm-300mm OD · BASF Antwerp Project)

Precision tubing
EN 10217-7 · 6mm-300mm OD · 10% higher thermal efficiency vs 316L

Precision Duplex Tubing — 8,000+ precision tubing components, 6mm to 300mm OD with EN 10217-7 compliance. Used in BASF Antwerp Ethylene Cracker (2025) — enabled 10% higher thermal efficiency vs traditional 316L stainless systems.

10

24-inch Super Duplex Pipe (High-Pressure Gas Transmission)

24-inch SDSS
24inch · API 5L Grade X70 · -2°C seabed + H2S resistance

24-inch Super Duplex Pipe — for high-pressure gas transmission (API 5L Grade X70 compatibility). Tested in -2°C seabed temperatures + H2S contamination. 0% hydrogen-induced cracking (HIC) after 18-month monitoring. 120km project deployed.

03 / Capabilities

What sets KCM Special Steel apart.

ISO 9001:2015 zero NCRs

ISO 9001:2015 (QMS) — zero non-conformities in last 4 audits.

DNV GL-ST-F101 3,000m subsea

DNV GL-ST-F101 — approved for 3,000m subsea depth.

20+ global standards

ASTM A312/A213/A269/A790/A789/A815/A928, JIS G3463, DIN 17456, GB 13296, plus 20+ standards.

Seamless innovation

Advanced cold-drawing + heat treatment processes eliminate weld seams — reducing weak points by 98% vs welded alternatives.

Marquee project portfolio

Brazil Libra Oil Field FPSO (3,500 tons), BASF Antwerp Ethylene Cracker, 120km super-duplex gas transmission.

Ready stock

Large inventory for urgent projects.

Custom alloys + sizes

Custom alloys (e.g. 6Mo add-ons), sizes, finishes for project-specific challenges.

Tested phase balance

Post-production hardness testing (HRC 28-32) + ferrite-austenite phase balance (45-55% ferrite).

07 / Contact

Direct line to KCM Special Steel.

Email(see duplexstainlesssteelpipes.com/contact)
Phone(see duplexstainlesssteelpipes.com/contact)
Address(see duplexstainlesssteelpipes.com/contact)
Websitehttps://www.duplexstainlesssteelpipes.com/
Direct contact
(see duplexstainlesssteelpipes.com/contact)
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