+86 21 6598 8999 hongguansteel@163.com Quotes within one business day · Mon–Sat 08:30–18:00 (GMT+8)
中文站  ·  Request a quote
Shanghai · Pressure piping components for corrosive and high-temperature service

Specialty alloy flanges and fittings built for the aggressive line

We forge, machine and test nickel alloys, duplex stainless, super austenitic stainless and titanium into flanges, fittings, pipe and custom forgings — with a mill certificate behind every heat.

  • ASME B16.5 / B16.47 and HG/T 20592-2009 pressure classes
  • Hastelloy, Inconel, Monel, 254SMO, 2205 / 2507, titanium
  • Licensed pressure piping component manufacturer (TS2731O85-2030)
Forged weld neck flanges in duplex stainless Forged in Shanghai
26product lines in the current range
60+alloy grades in the programme
100%inspection before despatch
3.1EN 10204 certificates as standard
Material families

Five alloy families, one supply chain

Nickel-based, iron–nickel, titanium and super austenitic grades held or sourced against the UNS number you specify.

Products

By product form

Flanges, pipe and tube, forged and butt-weld fittings, and custom forgings — machined to the standard or the drawing.

Most specified

Where most enquiries start

All 26 product lines
Inconel 625 weld neck flange machined in the workshop
100%PMI on finished alloy parts
Why HGPV

Material control is the product

Anyone can quote a grade. The difference is whether the certificate, the heat number and the part in the crate agree — and whether you find out before or after installation.

Material first

We buy to the UNS number, not to a trade name. Chemistry, grain size and heat treatment are checked against the mill certificate before the billet reaches the hammer.

Forged, not cast

Flanges and fittings are forged so the grain flow follows the part. No shrinkage porosity in the pressure boundary, and Charpy and tensile results that hold at low temperature.

In-house laboratory

Optical emission spectrometry, carbon–sulphur analysis, tensile and impact testing, hardness and metallography are carried out on site, so a non-conformance is found before shipment, not at your site.

Documents that clear customs

EN 10204 3.1 mill certificates, dimensional and PMI reports, heat-number mapping and packing lists are issued as standard — with third-party witness at SGS, BV or TUV when the project asks for it.

Applications

Built for the aggressive line

Application detail
Oil & gas

Oil & gas

Wet sour gas, produced water and amine service call for C-276, 625 and duplex flanges with NACE MR0175 compliance.

Petrochemical

Petrochemical

Hydrocrackers, reformers and acid-plant lines: 800H/HT, 625, 254SMO and alloy 20 fittings where chlorides and high temperature meet.

Chemical processing

Chemical processing

Sulphuric, hydrochloric and phosphoric acid circuits, including HF alkylation where Monel 400 and Hastelloy B-2/B-3 are the specified grades.

Power generation

Power generation

Superheater and reheat piping, flue-gas desulphurisation and nuclear auxiliary systems, with full heat traceability and third-party witness.

Desalination & marine

Desalination & marine

Seawater intake, brine and cooling systems in 2205, 2507, 254SMO and titanium — grades chosen for chloride pitting and crevice resistance.

Pharmaceutical & food

Pharmaceutical & food

Sanitary tube and fittings with Ra ≤ 0.

Quality

Incoming, in-process, final — and documented

Our laboratory verifies every incoming heat and every finished alloy part. The documents travel with the goods, not after them.

  • Chemical analysis and OES verification of every incoming heat
  • PMI on 100% of finished alloy parts
  • Hydrostatic test at 1.5× design pressure
  • Dimensional and visual inspection to the purchase specification
  • Hardness and, where specified, impact testing at low temperature
  • Pickling, passivation and protected packing for sea freight
See the inspection flow
Special Equipment Manufacturing Licence

Special Equipment Manufacturing Licence

TS2731O85-2030

Pressure piping components — forged steel flanges and forged fittings. Issued by the Shanghai Municipal Administration for Market Regulation, valid to 07 Jun 2030.

Type Test Certificate — WN flange

Type Test Certificate — WN flange

TSXY74101002720260032

Weld neck flange WN100 B-40 RF S=3.6 in S22053 duplex stainless, tested to TSG D7002-2023. Valid to 06 Aug 2030.

Type Test Certificate — socket weld tee

Type Test Certificate — socket weld tee

TSXY72301002720260017

Socket weld tee SF2205 3000 DN65 SW-T, covering stainless steel (material group V) and duplex stainless (group VI), forging grades I–IV. Valid to 29 Jul 2030.

Send the line list. Get a quotation with the material, standard and lead time.

Quotes within one business day. Send grade, size, pressure class, face type and quantity — a drawing works better than a description.

WhatsApp