Additional Requirement for DSS Material from COMPANY

Charpy V-Notch (ASTM A370)
Not applicable when the maximum obtainable Charpy specimen width less than 2.5mm Absorbed energy shall be 61J average and 48J Single value minimum Test temperature shall be minus 46 deg C. Impact test specimen taken from mid-thickness position.

Ferrite Count (ASTM ES62)
Ferrite content shall be determined by manual point count on a cross section near OD, ID surface & midwall location. Sample shall be electrolytically etched in NaOH or KOH, and in such a manner as to provide optimum contrast for austenite and ferrite phase discrimination. Minimum 30 field and 16 points per field shall be used. Ferrite content shall be between 40% to 60%.

Metallographic Examination
Sample shall be etched using ASTM E407, K3Fe (CN)6 with KOH or NaOH. Sample cross section shall be examined at OD, ID and midwall locations. Examination shall be conducted at a minimum of 400X to 500X magnification. Material shall be free of intermetallic phases and precipitates A microphotograph at a minimum of 400X to 500X shall be supplied.

Corrosion Test
Shall be carried out as per ASTM G4S at 25 deg C for 24 hours with an acceptance criteria of no visual pitting at 20X and weight loss of less than 4 g/m2.

NACE Hardness
Hardness test according to NACE MR-0175 the maximum shall be HRC 28, HB 271, or HV10 310.

Other Requirements
CONTRACTOR/COMPANY representative examination required for heat number traceability, visual examination, dimensional examination and mill test certificate review. All testing required to be per heat number.

NOTE:
Duplex Stainless Steel (DSS)
All DSS Material shall be in accordance with a minimum PREN of 34 according to the formula:
PREN = %Cr + 3.3×(%Mo + 0.5×%W ) + 16×%N

Hebei Lufeng Piping Equipment Co., Ltd. is ISO 9001 certified exporter & supplier of steel piping materials. We are committed to provide customers quality products with competitive prices and efficiency service.

Established in 2008, our experienced and friendly staffs are dedicated to provide you professional and considerate services. Located in Cangzhou city—called “the manufacturing base of China pipe fittings” and near to Tianjin port, geographic and economic advantages enable Lufeng to provide customers good prices and delivery time.

Our pipeline products include steel pipes/ tubes, buttwelding fittings, steel flanges, forged fittings, valves, gaskets, fasteners and other accessories. They are strictly manufactured according to ISO, ASME, ASTM, ANSI, API, MSS, AWWA, DIN, BS, EN, JIS, GB and other international standards. Production as per customer’s drawings or requests is also available.

In early 2023, we opened a new warehouse for duplex stainless steel products. Used for storage of duplex stainless steel 2205 & 2507 round bars, steel plates, steel pipes and flange blanks. These materials are from the most professional manufacturers in China.

LUFENG will be at your service at any time. If you have any needs or requirements, please contact us freely. Look forward to be your long-term and trusted partners for pipeline in China.

Catalogue of LFPCO-2020.pdf

Letter of presentation.pdf