About Us — 30 Years in Stainless Steel Piping

Company Profile

Who We Are

Founded in 1996 and headquartered in Shanghai, VAST LINK INTERNATIONAL CO., LIMITED brings 30 years in the steel pipe industry to the manufacture and export of stainless steel pipes, grooved pipe fittings and press fittings. Our production facility in Wenzhou, Zhejiang — China's manufacturing centre for stainless steel piping — covers 70,000 m² and employs a workforce of 420, including more than 30 engineers and quality technicians. We also operate a sales and service office in Busan, South Korea, serving distributors, wholesalers and project contractors in more than 40 countries.

Alongside our own production, we are a long-standing supply partner with Angang Steel and Masteel, two of China's largest state-owned steel groups, and a long-standing supply partner with TISCO for stainless steel coils — enabling raw-material traceability and stable lead times across the integrated supply chain. Our indoor warehouse and processing centre in Baoshan District, Shanghai keeps a coil bank feeding our own tube mills, with in-line slitting and export packing.

30+

Years in the industry

70,000 m²

production facility

420

Workforce

18,000 t + 23 M pcs

Pipes + coils + fittings / year

Production Facility

Made on Our Own Lines

Our Wenzhou base runs dedicated lines for tube and fittings under one roof — which is why we can match tolerances across a complete piping system and ship it in a single container.

Tube forming — coil slitting, roll forming, automatic TIG / plasma welding, online annealing and bright solution treatment.
Grooved fitting production — forging and casting, precision CNC machining and grooving to AWWA C606 and ISO 6182 dimensions.
Press fitting production — precision cold forming of thin-wall stainless fittings, automated O-ring seating, and socket tolerance control for leak-tight V-profile and M-profile pressing.
Surface & finishing — pickling, passivation, polishing and marking to customer specification.
Packing — export-standard woven bags, pallets, wooden cases and container loading plans built to reduce freight cost.

Vast Link Wenzhou production facility — exterior view

production facility & Warehouse

Inside Our Wenzhou Facility

Tube forming, grooved and press fitting production, and a stocked warehouse — all on one site, under one quality system.

Fitting production workshop with forming and welding lines

Hydraulic press machine — steel pipe workshop

Stainless steel fittings in production baskets

Vertical Integration, One Supply Chain

From incoming stainless coil to finished pipe and fitting — the entire chain runs on one site, one quality system, one traceability record. You receive pipe and fittings with matched chemistry and tolerances, because every step is controlled here. We list coils & sheets as the upstream raw material that feeds our own pipe production — and that customers sourcing flat product alongside fittings and pipe can buy from the same account.

Production Process

From Coil to Finished Fitting

Twelve controlled steps run in-house on our Wenzhou lines — laser cutting, hydroforming, automated welding, solution annealing, surface treatment, testing, O-ring seating and marking.

01

Laser Cutting

02

Laser Punching

03

Hydroforming

04

Auto Beveling

05

Automatic Welding

06

Solution Annealing

07

Pickling & Passivation

08

Ultrasonic Degreasing

09

Magnetic Polishing

10

Air Tightness Testing

11

O-Ring Installation

12

Laser Marking

Welded Pipe Line

From Coil to Finished Pipe

Twelve controlled steps turn stainless coil into welded, surface-finished and tested pipe on our Wenzhou lines.

01

Coil Slitting

02

Pipe Forming

03

Automatic Welding

04

I.D. Bead Leveling

05

O.D. Weld Grinding

06

Solution Annealing

07

Cut-to-Length

08

Pickling & Passivation

09

Polishing

10

Eddy Current Testing

11

Leak Testing

12

Film Wrapping

Quality Control Flow

In-House, At Every Stage

Inspection is not a final gate at our base — it runs from the incoming coil through to the certificate that ships with the goods. Our four-stage quality control flow is managed under an ISO 9001:2015 certified system.

Sampling Sampling inspection (AQL) 100% Full inspection of every piece

01

Incoming Inspection

Raw material coil, strip and purchased components

IQC

Dimensional

Calipers, micrometers, plug gauges

Sampling

Visual

Surface, defects

Sampling

Composition

Spectrometer, handheld XRF

100%

Hardness

Bench hardness tester

Sampling

02

In-Process Inspection

Two parallel lines: pipe-making and fittings

IPQC

IPQC runs on two parallel lines. Both must be cleared before packing.

Pipe-making

Line A

Dimensional

Calipers

Sampling

Visual

Weld seam, AQL

Sampling

Annealing

Online bright annealing

Sampling

Dimensional

After sizing

Sampling

Visual

100% visual check

100%

Performance

Hydrostatic, eddy current

100%

Fittings

Line B

Dimensional

Calipers, gauges

100%

Visual

Surface, marking

Sampling

Material

Handheld spectrometer

Sampling

Solution Check

Visual, hardness

Sampling

Performance

Hydrostatic, pneumatic

Sampling

03

Packaging Inspection

Before cartoning and palletising

QC

Visual

100% visual check

Sampling

Dimensional

Calipers, gauges

100%

Fit Check

Gauges and fixtures

Sampling

Packaging

Quantity, labelling

Sampling

04

Outgoing Inspection

Final release before shipment

OQC

Sampling

As per AQL level

Sampling

Packaging

Carton, pallet, marking

100%

Documentation

MTC and test certificates

IQC = Incoming Quality Control · IPQC = In-Process Quality Control · QC = Packaging Quality Control · OQC = Outgoing Quality Control. Sampling = AQL sampling inspection · 100% = full inspection of every piece.

Standards

Certification & Documentation

ISO 9001

Quality Management

Certified system covering all production

EN 10204

3.1 Mill Test Certificate

Issued per heat, full traceability

ASTM A312

Stainless Pipe

Seamless and welded tube

AWWA C606

Grooved Fittings

Grooving dimensions

Additional product approvals for potable water markets (WRAS, KTW / W270, NSF 61) can be confirmed on request — tell us your destination market and we will advise what applies.

Markets

Where We Ship

18,000 tonnes of stainless tubes and coils and 23 million pipe fittings a year, to distributors, wholesalers and project contractors in more than 40 countries.

Europe

Drinking water, heating and fire protection programmes for distributors and OEMs.

Middle East & Africa

Building services and municipal water projects, supplied in container volumes.

Southeast Asia

Stock-holding distributors resupplied on short, repeat cycles.

South America

Full-container mixed orders of pipe, fittings and coil.

North America

OEM and private-label production to customer specification.

Korea & East Asia

Supported directly from our Busan sales and service office.

Your account is held to you

We supply on a named-account basis: once a market or customer is registered with us, that account is supplied through us and not reassigned — so the customer base you build is not resold behind you.

Discuss your market

Certifications & Compliance