S31254 Dual-phase Steel Flanges in Various Industries with Material for Secure Connections

Crafted from S31254 super duplex stainless steel (UNS S31254), these premium flanges are engineered to conquer the most aggressive chloride-rich and acidic environments, delivering unmatched performance in offshore oil & gas, seawater desalination, chemical processing, and pharmaceutical industries. With a PREN ≥43 (Pitting Resistance Equivalent Number), they offer superior resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC), even in high-temperature, high-pressure conditions up to 300°C (572°F).

Key Advantages

✅ Exceptional Corrosion Resistance:

• High Molybdenum (6%) & Nitrogen (0.35%) Content: Defies chlorides, sulfuric acid, brine, and hypochlorite solutions, ideal for seawater cooling systems, bleach plants, and sour gas pipelines.

• Zero Leak Guarantee: Precision-machined RTJ (Ring-Type Joint) or RF (Raised Face) surfaces ensure flawless sealing in critical applications.

✅ Ultra-High Strength & Durability:

• Dual-Phase Microstructure (Austenite + Ferrite): Delivers 2x the yield strength of 316L steel (≥550 MPa) with excellent impact toughness for high-vibration, high-load environments.

• Resists Erosion & Fatigue: Perfect for abrasive slurry transport, subsea umbilicals, and cyclic thermal stress scenarios.

✅ Cost-Efficient Lifespan:

• Outlasts conventional duplex steels (e.g., S31803) and nickel alloys in chloride-rich media, slashing maintenance and replacement costs.

• Operates reliably in -50°C to 300°C (-58°F to 572°F), ideal for Arctic pipelines and tropical offshore platforms.

✅ Global Compliance & Traceability:

• Manufactured to ASTM A182, ASME B16.5, EN 1092-1, and NACE MR0175/ISO 15156 standards for sour service (H₂S environments).

• Full MTC 3.1 material certification, ISO 9001/PED 2014/68/EU compliance, and third-party NDT (UT/PT) reports ensure quality.

✅ Customizable Solutions:

• Types: Weld neck, slip-on, blind, threaded, and socket weld designs.

• Sizes: DN15 to DN2000, with tailored pressure ratings (Class 150 to 2500), bore alignments, and surface finishes (electropolishing available).

• Fast Delivery: Stock availability for standard sizes (DN15-DN600) with 10-day lead time on urgent orders.

Quality Inspection

Quality Management Department is establshed in the enterprise, which is responsible for the implementation of quallty management acrossall sectors, including QC, QA and implement and supervise various management system. The company reviews the Quality Manual byconducting management reviews annually to confirm its conformance, effectiveness and suitability.

Project Achievement

HENGLI Petrochemical 40 million / year ton of oil refining integration project	ZHEJIANG Petrochemical 40 million / year ton of oil refining integration project	LIANYUNGANG Petrochemical 3.2 million tons / young hydrocarbon comprehensive	YISHENG New Material The 6.6 million tons / year of the PTA project	CNOOC Huizhou Refining & Chemical Co Huilian Phase II, 22 million / year ton of oil refining Reconstruction and expansion project	Sinopec Zhenhai Refining & Chemical Company 1.2 million / year ton ethylene renovation and expansion project	Wanhua Chemical 480,000 tons / year bisphenol A integration project	GUANGXI Huayi New Materials Integration project of new chemical materials	CNOOC Shell The SMPO & POD project	China AtlantoShaanxi Coal Chemical Industry: 1.8 million tons / year ethylene glycol project
Hainan Huasheng 2.26 million tons / year non-photogamic polycarbonate project	Shenghong Refining The 16 million tons / year oil refining project	Anhui Haoyuan Chemical Industry 300,000 tons / year ethylene glycol project	Heilongjiang Longyou Petrochemical Company5.5 million tons / year heavy oil catalytic pyrolysis project	HuaLu Hengsheng 500,000 tons / year ethylene glycol project	Baofeng Energy600,000 tons / year methanol to olefin project	Jiangnan Shipyard (98000m³ liquefied ethane ship, etc.) Brand number: 316 / 316L, delivery time: 2020.12	Keppel shipyard in Singapore (FLNG ship) Brand number: 316 / 316L, delivery time: 2020.1	Guangzhou Wenchong Shipyard (Super double-phase steel desulfurization tower) Brand number: S32750 Delivery time: 2021.3	CSSC Dalian (FPSO, MV31, etc.) Brand number: 316L, etc., delivery date, 2019.8
725 Institute of China Shipbuilding Industry (Cu-Ni alloy Tube)	Nantong COCSO Shipyard (FSRU ship module)	CIMC Raffles (Drilling Rig)	CNOOC Orient 13-2 (Lined pipe)	CNOOC Bozhong 19-6 (Lined Pipe)	Petrobras MODEC FPSO (COSCO Shipping)	CNOOC Guangxi LNG, storage and transportation storage Brand number: 304 / 304L Specification: (8 "~32")×(3.76~9.53mm)	CNOOC Zhejiang LNG Phase II Brand number: 304 / 304L Specification: (6 "~28")×(7.11~10.31mm)	Sinopec Shandong LNG Phase II Brand number: 304 / 304L Specification: DN250 SCH10S	LIANYUNGANG Petrochemical A 4X160000m³ low-temperature ethane storage tank Brand number: 304 / 304L Specification: 813X12.7MM Delivery time: 2020.9
Sinopec Luoyang Institute Wenzhou LNG terminal Brand number: 304 / 304L Specification: 219.1~711X12.7MM Delivery time: 2022.3	Huatai Shengfu 160,000 m ³ low-temperature ethane storage tank Brand number: 304 / 304L Specification: 219~508X9.53MM	YAMAL LNG Brand number: 304 / 304L Specification: 406~914X9.53MM	Beijing Maiden Voyage	Oriental Hope	Sichuan Yongxiang 70,000 tons / year high purity polysilicon project	Xinjiang Daquan 25,000 tons / year high purity polysilicon project	Eagle Central China Paper Industry 500,000 tons of box board project	Guangxi Sun Paper 3.5 million tons of forest pulp and paper integration project	APP for Asian pulp and paper Chemical machine pulp and sewage treatment project
TCL Shenzhen Huaxing Optoelectronics semiconductor clean pipeline project	Beijing Daxing Airport	Hong Kong-Zhuhai-Macau/Macao Bridge Tubes used for stainless steel construction	CNNC Xiapu nuclear Power Plant Fast reactor demonstration project of CNNC 2.3	CONBA Stainless steel pipe for pharmaceutical engineering	Shenghong Refining Stainless steel associated heat pipe	Hangzhou Sewage Treatment Plant Stainless steel pipe for backwash purification unit	Qilu Pharmaceutical Fluid stainless steel pipe for raw material delivery	Zijin Mining Wet copper smelting, stainless steel sewage pipe	ect
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Certificate

API-5LD AUTHENTICATION	American Petroleum Institute API 5LC Certificate	ASME Certificate in the United States	EU PED&AD2000 certificate	ABS classification society certification certificate in the United States	DNV Det Norske Veritas Certificate	RINA Italian Bureau of Shipping Certificate	BV French Bureau of Shipping certification	LR Lloyd's Register Certificate of Approval	Customs Union EAC Certificate	Russian GOST certificate

Raw Material Vendors	Cooperation Partners

Why Choose S31254 Flanges?

• Risk-Free Procurement: 100% dimensional inspection and PMI (Positive Material Identification) testing.

• Technical Expertise: Free corrosion compatibility analysis, welding procedure specifications (WPS), and installation guidance.

• Sustainability: 100% recyclable material with extended lifecycle, reducing environmental footprint.