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Quality Control

VVINSCO | QUALITY ASSURANCE

Strict Quality Control from Raw Material to Final Shipment

Professional Stainless Steel Quality Inspection & Manufacturing Control

23+ Years of Stainless Steel Manufacturing Experience

At Foshan Winsco Metal Products Co., Ltd. (VVINSCO), quality control is an essential part of our stainless steel manufacturing and export operations.

From raw material selection to final container loading, our inspection procedures are designed to verify material grades, dimensions, surface finishes, processing quality, packing and shipment requirements.

We supply stainless steel tubes, sheets, plates and railing accessories in grades including 201, 304, 304L, 316, 316L and 430, with customized specifications available for international buyers.

01

Raw Material Inspection

Quality starts with the selection of suitable raw materials. Before production, our team checks incoming stainless steel materials against the purchase order and agreed technical requirements.

Key inspection points include material grade, thickness, width, size, surface condition and material identification.

(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Raw Material Inspection | Checking stainless steel materials before production.
Quality Focus: Material identification, incoming material condition and order specification verification.
02

Material Grade Verification

Correct stainless steel grade selection is important for corrosion resistance, mechanical performance and the intended application.

Our available materials include AISI 201, 304, 304L, 316, 316L and 430. Chemical composition testing and material verification can be arranged according to order requirements.

(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Material Grade Inspection | Checking stainless steel material identification.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Material Verification | Supporting the identification of ordered stainless steel grades.
Available Documentation: Material Test Certificates (MTC) and additional chemical analysis reports, as agreed for the order.
03

Dimension & Thickness Inspection

Dimensional accuracy is important for installation, fabrication and compatibility with other components.

Our inspection team checks outside diameter, width, height, wall thickness, length and other critical dimensions using suitable measuring instruments.

(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Dimensional Inspection | Verifying product dimensions against agreed specifications.
Custom Orders: Dimensional tolerances are confirmed according to approved drawings, samples or agreed specifications.
04

Straightness & Shape Inspection

Stainless steel round, square, rectangular and customized profile tubes require appropriate dimensional and shape control.

We inspect straightness, roundness, squareness and overall profile conformity based on the product type and customer requirements.

(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Shape Inspection | Checking tube geometry and profile consistency.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Profile Verification | Reviewing shape accuracy for fabrication and installation.
05

Surface Quality Inspection

Surface finish is a key quality factor for decorative stainless steel products used in architecture, furniture, interior decoration and railing systems.

We check visible scratches, dents, polishing consistency, color variation and other surface imperfections according to the approved finish and inspection requirements.

(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Surface Quality Control | Visual inspection of stainless steel finish and appearance.
Surface Options: 2B, BA, No.4, brushed, mirror, PVD colored, embossed and water ripple finishes.
06

Processing & Detail Inspection

During manufacturing and fabrication, inspection helps maintain consistency and reduce processing defects.

Inspection points may include cutting edges, weld seams, bending accuracy, polishing details, hole positions and other customized features.

(GuangDong)Foshan Winsco Metal Products Co., Ltd.
In-Process Inspection | Checking product quality during manufacturing.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Processing Detail Control | Verifying workmanship and fabricated components.
07

Finished Product Inspection

Before packing, finished products are checked against confirmed order specifications and applicable inspection criteria.

Our final product inspection covers material identification, dimensions, surface appearance, workmanship, quantity and labeling.

(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Finished Product Verification | Checking product conformity before packing.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Appearance Inspection | Reviewing the condition of finished stainless steel products.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Final Quality Check | Preparing inspected products for export packing.
Inspection Criteria: Confirmed order details, approved samples, technical drawings and applicable standards.
08

Packing & Quantity Verification

Export packing is important for protecting stainless steel surfaces and minimizing damage during transportation.

Before shipment, our team checks product quantities, package weight, identification labels, protective materials and shipping marks.

A. Stainless Steel Product Packing

Suitable packaging methods are selected according to product dimensions, finish, weight and shipping requirements.

(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Product Packing | Export packaging example 01.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Product Protection | Export packaging example 02.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Packing Inspection | Export packaging example 03.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Protective Packaging | Export packaging example 04.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Export Preparation | Packaging example 05.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Packing Arrangement | Packaging example 06.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Protective Packing | Packaging example 07.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Shipment Preparation | Packaging example 08.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Export Packing | Packaging example 09.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Product Protection | Packaging example 10.

B. Packing Inspection & Quantity Control

Packed goods are reviewed against the packing list and customer requirements. Special packing instructions and shipping marks are confirmed before dispatch.

(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Packing Verification | Inspection record 01.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Packaging Check | Inspection record 02.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Export Packing Control | Inspection record 03.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Packaging Review | Inspection record 04.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Quantity Control | Inspection record 05.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Packing Verification | Inspection record 06.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Product Packing Review | Inspection record 07.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Export Quality Check | Inspection record 08.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Packaging Condition | Inspection record 09.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Shipping Preparation | Inspection record 10.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Packing Review | Inspection record 11.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Packaging Inspection | Inspection record 12.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Pre-Shipment Check | Inspection record 13.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Final Verification | Inspection record 14.
Packing Options: Protective film, woven bags, bundles, cartons, wooden cases and other agreed export packaging methods.
09

Container Loading & Final Shipment Inspection

The final stage of our quality control process focuses on shipment readiness, container loading arrangements and the condition of packed goods.

We check loading quantities, packing condition and container loading arrangements. Loading photographs can be provided when required.

A. Pre-Loading Preparation

Products and packages are prepared for dispatch according to shipment instructions.

(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Shipment Preparation | Loading documentation photo 01.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Pre-Loading Check | Loading documentation photo 02.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Export Preparation | Loading documentation photo 03.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Loading Preparation | Loading documentation photo 04.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Shipment Readiness | Goods prepared for export delivery.

B. Container Loading & Shipment Records

Loading photographs help document the handling and arrangement of export goods before shipment.

(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Loading Record | Shipment photo 01.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Loading Record | Shipment photo 02.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Loading Record | Shipment photo 03.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Loading Record | Shipment photo 04.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Export Shipment | Loading photo 05.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Export Shipment | Loading photo 06.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Export Shipment | Loading photo 07.
(GuangDong)Foshan Winsco Metal Products Co., Ltd.
Export Shipment | Loading photo 08.
Shipment Documentation: Packing lists, commercial invoices, applicable certificates and loading photos can be prepared according to the agreed export requirements.

Inspection Reports & Third-Party Inspection

VVINSCO supports transparent quality verification for international stainless steel buyers.

Depending on the product and order agreement, supporting documents may include:

  • Material Test Certificate (MTC), including EN 10204 3.1 where applicable
  • Chemical composition analysis reports
  • Dimensional and visual inspection records
  • Product packing lists and shipment documents
  • Third-party inspection arrangements upon request

Customers are welcome to discuss specific inspection requirements before production.

Frequently Asked Questions

Q1. How does VVINSCO control stainless steel product quality?

We follow a nine-stage inspection workflow covering raw materials, grade verification, dimensions, shape, surface finish, processing, finished goods, packing and shipment.

Q2. Can VVINSCO provide stainless steel material certificates?

Yes. Material certificates and relevant inspection documents can be arranged according to the order and agreed requirements.

Q3. Can you manufacture stainless steel products according to customer drawings?

Yes. We support customized stainless steel tubes, sheets and fabricated components based on drawings, samples and confirmed specifications.

Q4. Is third-party inspection accepted?

Yes. Third-party inspection can be coordinated before shipment, subject to prior agreement.

Looking for a Reliable Stainless Steel Manufacturer?

Partner with VVINSCO for customized stainless steel tubes, sheets, plates and railing accessories with professional manufacturing and quality inspection support.

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Certification

(GuangDong)Foshan Winsco Metal Products Co., Ltd. Certifications
Standard: CCPIC
Number: 114403A1/13946
Issue Date: 2011-03-31
Scope/Range: Stainless steel export
Issued By: CCPIT
(GuangDong)Foshan Winsco Metal Products Co., Ltd. Certifications
Standard: SGS
Number: GZIN1801000774ML
Issue Date: 2018-01-10
Scope/Range: stainless steel sheet,pipe,handrail fittings,metal fabrication
Issued By: SGS
(GuangDong)Foshan Winsco Metal Products Co., Ltd. Certifications
Standard: JIS G 4304:2012 SUS 430
Number: W19350010
Issue Date: 2019-12-16
Scope/Range: Hot Rolled Stainless Steel Coil
Issued By: Foshan Winsco Metal Products Co., Ltd.
(GuangDong)Foshan Winsco Metal Products Co., Ltd. Certifications
Standard: 201 J4 high Copper
Number: Chemical Composition Test (Fe-30 / Cr-Ni Steel)
Issue Date: 2026-08-31
Scope/Range: Stainless Steel Material Composition Test
Issued By: Foshan Winsco Metal Products Co., Ltd.
(GuangDong)Foshan Winsco Metal Products Co., Ltd. Certifications
Standard: ASTM A240 / SUS 316
Number: WINSCO-QC-316-001
Issue Date: 2026-08-31
Scope/Range: 316 Stainless Steel Chemical Composition Test
Issued By: Foshan Winsco Metal Products Co., Ltd.
(GuangDong)Foshan Winsco Metal Products Co., Ltd. Certifications
Standard: 303 STAINLESS STEEL FREE-MACHINING BAR CHEMICAL COMPOSITION INSPECTION CERTIFICATE
Number: WINSCO-QC-303-001
Issue Date: 2026-08-31
Scope/Range: 303 Stainless Steel Free-Machining Bar Chemical Composition Test
Issued By: Foshan Winsco Metal Products Co., Ltd.
(GuangDong)Foshan Winsco Metal Products Co., Ltd. Certifications
Standard: ASTM A240 / SUS 304
Number: WINSCO-QC-304-001
Issue Date: 2024-06-01
Scope/Range: 304 Stainless Steel Chemical Composition Test
Issued By: Foshan Winsco Metal Products Co., Ltd.
(GuangDong)Foshan Winsco Metal Products Co., Ltd. Certifications
Standard: ASTM A240 / SUS 304
Number: WINSCO-QC-304-002
Issue Date: 2025-06-01
Expiry Date: 2025-06-01
Scope/Range: 304 Stainless Steel Round Pipe
Issued By: Foshan Winsco Metal Products Co., Ltd.
(GuangDong)Foshan Winsco Metal Products Co., Ltd. Certifications
Standard: SUS 201 J1
Number: WINSCO-QC-201J1-001
Issue Date: 2021-03-09
Scope/Range: 201 J1 Stainless Steel Chemical Composition Test
Issued By: Foshan Winsco Metal Products Co., Ltd.
(GuangDong)Foshan Winsco Metal Products Co., Ltd. Certifications
Standard: YB/T 6110-2023 / 201 J4
Number: WINSCO-QC-201J4-001
Issue Date: 2024-07-03
Scope/Range: 201 J4 Hot Rolled Stainless Steel Coil / Strip
Issued By: Foshan Winsco Metal Products Co., Ltd.
(GuangDong)Foshan Winsco Metal Products Co., Ltd. Certifications
Standard: JIS G4312 SUH 409L
Number: WM231121B-02
Issue Date: 2023-11-21
Scope/Range: Cold Rolled Stainless Steel Products
Issued By: WINSCO METAL QC Department
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