blind flange jis 10k & alloy steel flanges supplier | Wholesale

Many buyers pay 20–40% above factory price because they source through agents. A Tier-1 supplier like us eliminates this entirely.

▲ TCO overrun: $18k–$65k per project

Non-traceable raw material leads to flange failures under pressure. In a 2025 study, 23% of failed couplings traced back to subgrade alloy steel.

▲ Unplanned downtime: $10k/hour in O&G

LCL shipments for flanges are notoriously uneconomical. We combine consolidation points and optimize container loads — reducing freight by 18–22% on average.

▲ Freight waste: $3,200 per container

Missing EN 10204 3.2 certs, incorrect JIS B2220 markings, or outdated material test reports can halt your entire site approval.

▲ Approval delay: 2–6 months

Our facility in Mengcun Hui County, Hebei Province — China's largest pipe fitting production cluster — gives you direct access to the source. You pay factory cost, not export chain margins.

• Own production lines + partner network

• Monthly output: 2,500+ tons

• In-house QC lab: chemical, tensile, hardness

Our sales engineers (BSc/MSc in Mechanical Engineering) review your P.O. and drawings within 2 working days. Most quotes include dimension verification, material certification scope, and freight estimate.

• Free DFM feedback on custom bore/facing

• OEM & ODM design support

• RFQ → quotation in 3 steps

Exporting to USA, Russia, Canada, Kazakhstan, Algeria, Yugoslavia, Middle East, South Asia, Africa, and Europe. We understand local compliance, documentation, and shipping nuances.

• FOB / CIF / DDP — flexible terms

• Consolidated container loading

• Project-based BOM supply

1.25Cr-0.5Mo-Si steel. Excellent creep strength in the 400–540°C range.

• Hydrocracking units

• Reformer furnaces

• High-temp steam lines

2.25Cr-1Mo steel. The workhorse for hydro-processing and elevated-temperature hydrogen service.

• Hydrodesulfurization (HDS)

• Hydrocrackers

• Subcritical boiler piping

5Cr-0.5Mo steel. Superior resistance to high-temperature sulfidation and naphthenic acid corrosion.

• Crude distillation units

• Vacuum towers

• Thermal cracking units

9Cr-1Mo-V-Nb steel. Advanced creep-fatigue resistance for ultra-supercritical power plants.

• USC boiler headers

• Fast-track power generation

• High-temperature manifolds

Petrochemical — Hydrocracker Unit

Client: Middle East refinery (Jebel Ali, UAE)

Supplied A182 F22 blind flanges in sizes 150A–300A (Class 300) with RTJ facing. All flanges passed PMI, 100% ultrasonic inspection, and hydrostatic testing to 1.5× design pressure.

✓ Result: Zero leaks in 36 months of operation

Water Treatment Plant — JIS 10K FF Blind Flanges

Project: Municipal desalination plant (Singapore)

Supplied JIS 10K blind flanges (SS400, FF face, DN50–DN200) with EPDM gaskets for seawater isolation lines. Painted with 3-layer epoxy for 15-year service life.

✓ Result: 22% lower cost vs. local distributor, delivered in 3 weeks

Power Generation — USC Boiler Header

Client: Thermal power EPC contractor (Kazakhstan)

Supplied A182 F91 WN flanges (ASTM B16.5, Class 1500) for ultra-supercritical steam headers. Full heat treatment documentation + third-party witness testing.

✓ Result: Passed client's third-party audit with 100% compliance

James R.

Procurement Lead, Texas (USA)

"We source JIS 10K blind flanges for our water treatment projects. Cangzhou Weihuan delivered 2,000 pieces in 5 weeks — 3 weeks faster than our previous Korean supplier. The PPAP documents were flawless, and we saved 29% on landed cost."

★ ★ ★ ★ ★

Ahmed Al-Mansoori

Senior Engineer, Abu Dhabi (UAE)

"As the alloy steel flanges supplier for our hydrocracker revamp, they supplied F22 flanges with EN 10204 3.2 certs. Third-party PMI verified 100% of the batch. Their technical support during the pre-engineering call was genuinely valuable."

★ ★ ★ ★ ★

Michael T.

Project Director, Rotterdam (Netherlands)

"Their freight consolidation saved us €8,400 on a 40ft container compared to our previous LCL method. The JIS 10K blind flanges were well-packed with no surface damage. Highly responsive sales team."

★ ★ ★ ★ ★

JIS 10K refers to a pressure rating of 1.0 MPa (10 bar) in the Japanese Industrial Standard JIS B2220. While both JIS 10K and ANSI Class 150 are often used in similar low-pressure lines, they are not dimensionally interchangeable — bolt circle, bolt diameter, and facing dimensions differ. Always match your flange standard to the piping spec. We can also supply adapter flanges if your system uses mixed standards.

For standard carbon steel JIS 10K blind flanges, MOQ is 100 pieces per size. For alloy steel (F11/F22/F91) or stainless steel, MOQ is 50 pieces per size. However, we accept trial orders of 10–20 pieces for sample qualification at sample pricing.

Yes. We routinely supply custom facing types (RF, FF, RTJ, TG), special bore sizes (reduced bore for specific pipe schedules), and drilled-but-not-spotted bolt hole configurations for field alignment. Provide your drawing or a detailed description — our engineers will confirm feasibility within 24 hours.

Standard documents include: Material Test Certificate (EN 10204 3.1), dimensional inspection report, heat treatment charts (for alloy steels), PMI report, and a packing list with photos. We can also arrange third-party inspection (SGS, BV, TÜV, Lloyds) at the buyer's cost.

For standard carbon steel JIS 10K blind flanges in stock: 7–14 days. For alloy steel flanges requiring forging + heat treatment: 3–6 weeks. We provide real-time production milestone updates with photos to ensure full visibility.

We operate on FOB, CIF, CFR, and DDP terms. For US and European projects, we have experience with CE marking requirements and US customs clearance. We can consolidate multiple products (flanges, pipes, fittings) into a single container to reduce your per-unit freight cost.

Yes. We provide a 12-month warranty against manufacturing defects and workmanship issues. Our sales engineer is assigned to your account for the entire project lifecycle — from pre-order engineering to post-delivery installation support.

Dmitry K. — Almaty, Kazakhstan

"For a district heating expansion, we purchased 1,500 pieces of JIS 10K blind flanges + carbon steel elbows. The quality was so consistent that our on-site inspection rejected only 3 pieces — and their QC replaced them without dispute. This is how a good supplier behaves."

Bryan L. — Alberta, Canada

"The sales engineer actually knew the JIS B2220 standard better than our local distributor. They helped us identify that our spec called for 10K FF but our piping was welded with a raised-face expectation. Prevented a $30k field rework."

Sergey V. — Saint Petersburg, Russia

"Heavy industry requires serious suppliers. Cangzhou Weihuan provided A182 F11 alloy steel flanges for our steam pipeline with full normalized + tempered heat treatment records. Every gasket surface was machined to a 125 Ra finish. Impressive."