Zhejiang Jigong Valve Co., Ltd. is one of the most reliable manufacturers and suppliers of duplex stainless steel valve balls in China. If you're going to wholesale cheap duplex stainless steel valve balls made in China, welcome to get pricelist from our factory. All customized products are with high quality and low price.
Basic Introduction
Duplex stainless steel valve balls are made from austenitic-ferritic duplex stainless steel (such as 2205, 2507, etc.), combining the excellent corrosion resistance of austenitic stainless steel with the high strength characteristics of ferritic stainless steel. In chloride environments, its resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) is significantly superior to ordinary austenitic stainless steels (such as 304, 316). At the same time, mechanical strength (yield strength about twice that of 316L) and fatigue resistance are greatly improved. Its duplex structure endows the product with excellent erosion and wear resistance. Combined with high-precision spherical processing, it can maintain long-term stable operation under combined conditions of moderate corrosion and high alternating pressure loads. The products are especially suitable for fluid control scenarios requiring high corrosion resistance and structural strength, such as seawater treatment, oil and gas transportation, chemical desulfurization, and coastal industrial pipelines.
Product Specification
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Indicator items |
Technical specifications |
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Size range |
1/2" to 48" (supports non-standard customization) |
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Pressure rating |
PN16-PN160(Class150-900) |
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Spherical material |
Duplex stainless steels such as 2205 (S31803) and 2507 (S32750). |
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Manufacturing process |
Forging + solution treatment + precision machining + sealing surface grinding and polishing |
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Coaxiality |
≤0.05mm |
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Roundness accuracy |
≤0.02mm |
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Surface roughness |
Ra ≤ 0.4 μm (sealing surface) |
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Outer diameter tolerance |
1/2" – 4": +0.03 mm |
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Inner diameter tolerance |
1/2" – 4": 0~+0.03 mm |
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Applicable temperature |
-50°C to 350°C (depending on material grade) |
Product Features
- The austenitic-ferritic biphasic structure combines excellent corrosion resistance with high strength, with yield strength reaching twice that of ordinary austenitic stainless steel
- It has excellent resistance to chloride ion pitting and crevice corrosion, with a critical pitting temperature (CPT) far above 316L, making it suitable for environments with high salinity media
- It has outstanding resistance to stress corrosion cracking and is highly reliable in safe service in media prone to stress corrosion, such as hydrogen sulfide and chlorides
- It boasts excellent mechanical strength and fatigue resistance, can withstand higher pressure levels and alternating loads, and is suitable for high-pressure and frequent opening and closing conditions
- Excellent erosion and abrasion resistance maintain sealing surface integrity in media containing small amounts of solid particles
- Excellent corrosion fatigue resistance extends the service life of valves under the combined effects of corrosion and alternating loads
Product Application Scope / Usage Scenarios
Applicable media:
Seawater, high-salinity brine, industrial circulating water containing chloride ions, oil and gas field extraction water, acidic oil and gas (containing H₂S/CO₂), dilute sulfuric acid/dilute phosphoric acid, organic acids, alkaline liquid, flue gas desulfurization slurry, etc
Applicable operating conditions:
Corrosive environments with high chloride ion concentration, medium temperature and pressure conditions, alternating loads and frequent opening and closing, erosion conditions containing small amounts of solid particles, and marine environments in atmospheric and tidal zones
Application fields:
Seawater desalination and seawater cooling systems, offshore oil and gas platforms and subsea pipeline valve support, oil and gas gathering and refining desulfurization units, flue gas desulfurization (FGD) systems for the chemical industry, circulating water systems for coastal power plants, paper and pulp industries, bridge and coastal infrastructure fluid control
FAQ
What are the core advantages of duplex stainless steel valve balls?
The core advantage of duplex stainless steel valve balls lies in the synergistic effect of "high strength + high corrosion resistance." Its yield strength is about twice that of 316L stainless steel, allowing it to withstand higher pressure at the same wall thickness; Additionally, due to its austenitic-ferrite biphase structure being insensitive to chloride ions, its resistance to pitting, crevice corrosion, and stress corrosion cracking far surpasses that of conventional austenitic stainless steel, making it especially suitable for replacing ordinary stainless steel products in marine engineering and oil and gas transportation scenarios where high salinity, high chloride ions, and alternating loads coexist.
What is the difference between duplex stainless steel valve balls and ordinary austenitic stainless steel valve balls (such as 316L)?
316L has a single-phase austenitic structure with limited strength and resistance to stress corrosion, and poses risks of pitting and stress corrosion cracking in chloride ion environments; Due to the two-phase structure containing roughly equal proportions of austenitic and ferritic components, the yield strength is roughly doubled, the pitting equivalent (PREN) value is higher, and the stress corrosion resistance is significantly enhanced. Under the same corrosive medium conditions, duplex stainless steel valve balls can safely operate within higher chloride ion concentrations and temperature ranges.
How to choose between 2205 and 2507 materials?
2205 is an economical duplex stainless steel, suitable for medium chloride ion concentrations (such as seawater cooling and desalination pretreatment) and conventional oil and gas conditions; 2507 is a super duplex stainless steel with higher chromium, molybdenum, and nitrogen content, stronger resistance to pitting and crevice corrosion, and a higher critical pitting temperature, suitable for harsh corrosive environments such as high temperature, high salinity, strongly acidic media, and deep-sea oil and gas extraction. Model selection should be evaluated comprehensively based on chloride ion concentration, temperature, pH value, and pressure level of the medium.
What special requirements are there for welding or processing duplex stainless steel valve balls?
During forging and subsequent processing, the solution treatment temperature and cooling rate of duplex stainless steel valve balls must be strictly controlled to ensure a balanced ratio between austenite and ferrite, preventing precipitation of harmful metals (such as σ phases), thereby guaranteeing corrosion resistance and mechanical properties. Our company possesses a mature thermal processing and solution treatment process system to ensure product microstructure uniformity and performance consistency, meeting the strict quality requirements for high-end valve support.
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