304H​ Stainless Steel Flanges in Various Industries with Material for Secure Connections

Crafted from 304H stainless steel (UNS S30409), these precision-engineered flanges deliver exceptional high-temperature stability and oxidation resistance, making them ideal for power generation, petrochemical refineries, heat exchangers, and industrial boilers. With elevated carbon content (0.04-0.10%), 304H outperforms standard 304/L grades in creep resistance and structural integrity at sustained temperatures up to 815°C (1500°F), ensuring secure, leak-proof connections in demanding thermal cycling and steam environments.

Key Benefits:
✅ Superior High-Temp Strength: Optimized for steam lines, exhaust systems, and furnace components requiring long-term stability under extreme heat.
✅ Oxidation & Corrosion Resistance: Chromium-nickel alloy resists scaling and degradation in oxidizing atmospheres, mild acids, and alkaline media.
✅ Cost-Effective Durability: Balances high-temperature performance with affordability, reducing lifecycle costs in energy and processing plants.
✅ Global Compliance: Manufactured to ASTM A182, ASME B16.5, EN 1092-1, and PED 2014/68/EU standards, backed by full material traceability (MTC 3.1) and ISO 9001 certification.
✅ Seamless Integration: Compatible with standard piping systems, minimizing retrofitting expenses.

Customizable Solutions:

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

• Sizes: DN10 to DN1500, with customizable pressure ratings (Class 150 to 1500) and face finishes (RF, FF, RTJ).

• Post-Treatment: Solution annealing and passivation available for enhanced corrosion resistance.

Why 304H Flanges?

• Proven in Critical Applications: Trusted in coal-fired plants, LNG facilities, and food processing equipment requiring FDA-compliant materials.

• Adaptability: Performs reliably in both high-heat and cryogenic conditions (-200°C to +815°C).

• Fast Delivery: Global stock availability for common specifications, ensuring timely project execution.

Trusted by Industry Leaders Worldwide – Elevate your high-temperature piping systems with 304H flanges that combine affordability, compliance, and unwavering performance.

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

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Everest Technology (Wuxi) Co., Ltd. is a one-stop industrial innovation solution provider, specializing in premium raw materials, precision manufacturing, and green technology. We empower global clients with end-to-end services from design to delivery, rooted in material expertise, smart manufacturing, and sustainable innovation.