
We are a pipe fittings customization specialist
Steel pipes, fittings and flanges to GB, API, ASTM, ASME, BS, DIN, JIS and GOST standards - custom engineering welcome.

Steel pipes, fittings and flanges to GB, API, ASTM, ASME, BS, DIN, JIS and GOST standards - custom engineering welcome.

Dual production bases: carbon steel in Tianjin, stainless and alloy steel in Wenzhou.

Consolidated supply for EPC projects - one supplier, one inspection team, one shipment.
Pipes, fittings, valves and pumps consolidated into one inspected shipment.
Every order inspected by our dedicated QC team before shipment.
WHY SPAI STEEL
Numbers behind the one-stop supply promise.
WHO WE ARE
Hunan Spai Pipe Industry Co., Ltd (Spai Steel) is the steel pipes and fittings subsidiary of SP Group, founded in 1996 and exporting to more than 100 countries. We supply carbon steel, alloy steel, stainless steel and special grades - including duplex, super austenitic and nickel alloys - as seamless, ERW, LSAW and SSAW pipe, butt-weld fittings, flanges, valves, clamps, structural sections and photovoltaic mounting systems, to GB, API, ASTM, ASME, BS, DIN, JIS and GOST standards. Serving EPC contractors and project buyers, we consolidate the whole package into one inspected shipment with unified EN 10204 3.1 documentation - and as customized fittings experts we take the special-material and special-shape jobs many factories decline.
Spai Steel is the steel pipes and fittings subsidiary of SP Group, founded in 1996. For more than 28 years SP Group has served 1,000+ corporate clients and 300,000+ individual customers worldwide. We supply carbon steel, alloy steel, stainless steel, duplex and super-alloy products to GB, API, ASTM, ASME/ANSI, BS, DIN, JIS and GOST standards, plus client-specific technical specifications. Carbon steel is produced in Jinghai, Tianjin; stainless and alloy steel in Longwan, Wenzhou. Our vision is to be a reputable one-stop steel pipe and fittings service provider; our mission is to use Spai Steel to build a shining world; our core values are reliability, gratitude, integrity and quality.

PRODUCT CATEGORY
Steel pipes, fittings, press fitting systems, pumps and PV brackets.

Casing and tubing for oil wells to API 5CT - seamless and ERW supply.

OD 21.3-660mm, galvanized and black, to GB/BS/EN/JIS/ASTM/API.

3PE, FBE, epoxy and galvanized systems for buried, submarine and fire lines.

Cr-Mo alloy pipe to ASTM A335, grades P5-P91.

Austenitic and duplex pipe and tube to ASTM A312 / A269, TP304 to 316L and 310S.

H-beam, angles, channels and hollow sections to GB, ASTM and EN.

B16.9 butt-weld fittings and B16.5/JIS/BS4504 flanges.

Concrete pump parts, valves and hydraulic fittings.

Cable reels, shore power boxes and solar panels.

Solar street lights and ductile iron manhole covers.
ONE-STOP SUPPLY
PROJECT SUPPLY
Oil and gas, water treatment, civil construction, power, marine and offshore, mining and chemical. Select any tile to open the full project page - or use the Projects menu for a complete list.

Cross-country pipeline supply.

Trunk-line pipe package.

Water transmission line pipe.

Structural and process pipe.

Boiler and structural pipe.

Offshore pipe and fittings.

Mining project pipe package.

Alloy and stainless pipe.
VALUE-ADDED
Twelve processing services in three groups, carried out in-house and documented - select a group for the specifications.

Slotting, cutting, threading and grooving: slots 0.012-0.500 inch on 1.900-20 inch OD and lengths from 2 inches to 60 feet.

Shot blasting, 3PE and FBE coating and hot-dip galvanizing from 40 to 275 g/m2.

Custom fabrication to drawing, inspection on every order, export packing, warehouse and export logistics.
FACTORY
Carbon steel in Jinghai, Tianjin; stainless and alloy steel in Longwan, Wenzhou. Twelve principal units, eight in-line manufacturing stages and seven inspection stages - select any tile to open the factory page.
KNOWLEDGE
Procurement guides and project supply notes from our engineering team.
All articles
ASTM A335 P91 is a 9% Cr-1% Mo martensitic heat-resistant alloy pipe for high-temperature service: key properties, sizes and production.

ASTM A335 P22 seamless alloy pipe for high-temperature, high-pressure service: characteristics, applications, selection points and buying FAQ.

A practical buying guide for procurement teams: how to match standards and grades, what to check in mill certificates, and which inspection steps prevent costly rework on steel pipe orders.
FAQ
Answers before your first inquiry.
<script type="application/ld+json">{"@context":"https://schema.org","@type":"Organization","name":"Spai Steel (Hunan Spai Pipe Industry Co., Ltd)","url":"https://spaisteel.com","foundingDate":"1996","description":"One-stop steel pipe and fittings supplier - seamless, ERW, LSAW and SSAW pipe, butt-weld fittings, flanges, valves and clamps to GB, API, ASTM, ASME, BS, DIN, JIS and GOST standards.","contactPoint":{"@type":"ContactPoint","telephone":"+8615874086780","email":"melinda@spai-steel.com","contactType":"sales","areaServed":["Middle East","Southeast Asia","Europe","Africa","Latin America","Oceania"]}}</script>
CONTACT
You are welcome to leave us a message - share your standard, sizes and destination port.
Inquiry intake
Share a few details about your request so we can send a useful reply.