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The GB/T 12459 DN 50 Sch10S straight cross is a butt-weld pipe fitting designed for equal-diameter flow distribution and convergence in pipeline systems. It connects four pipeline sections of the same nominal size on the same plane, supporting stable fluid diversion and collection across commercial procurement and industrial pipeline projects. This fitting follows standardized dimensional parameters and is compatible with Sch10S wall thickness stainless steel pipelines.
This straight cross is manufactured in accordance with multiple mainstream global pipe fitting standards, including GB/T 12459, ASME B16.9, EN 10253-2, JIS B2312 and ISO 5251. Dimensional tolerances, wall thickness uniformity and end preparation all meet the requirements of the above standards, enabling direct matching with pipeline components produced under corresponding standards. The GB/T 12459 compliance covers dimensional structure and mechanical performance requirements specified in the Chinese national standard for butt-weld steel pipe fittings.
The fitting is available in multiple stainless steel grades to adapt to different working conditions:
ASTM A403 WP304L: For general corrosive environments and normal temperature working conditions
ASTM A403 WP316L: For scenarios with higher chloride ion corrosion resistance requirements
ASTM A815 UNS S31803: Duplex stainless steel for high-strength and moderate corrosion conditions
UNS S31254 (254 SMO): For highly corrosive environments such as seawater and chemical media
UNS N06625 (Inconel 625): For high-temperature and strong corrosion industrial scenarios
The DN 50 Sch10S straight cross adopts engineering-optimized structural design, targeting fluid stability and structural reliability in industrial pipeline operation.
The branch port adopts a 45° cut design, optimized through CFD simulation. At a flow velocity of 3 m/s with clean water at 20°C, this design reduces pressure drop by 55% compared with standard 90° branch cut structures, supporting more balanced flow distribution among four ports. For fire sprinkler systems, this design helps control pressure difference between branches within 0.1 bar under rated flow conditions.
The run pipe section adopts a reinforced structure with thickness equal to 0.4 times the nominal wall thickness, which improves resistance to water hammer impact. Under normal temperature working conditions with 304L material, the fitting can withstand 20 bar instantaneous water hammer impact within the allowable working pressure range. The wall thickness transition area adopts smooth treatment to reduce stress concentration during pressure fluctuations.
The standard product adopts industrial-grade pickling and passivation surface treatment. For pharmaceutical and food industrial scenarios, optional electropolished (EP) surface treatment is available, with surface roughness Ra ≤ 0.4μm and runner dead zone less than 0.1mm, which complies with 3-A sanitary standards. This custom option requires separate specification during commercial procurement.
This straight cross fitting adapts to multiple industrial scenarios, with typical applications including:
Fire sprinkler systems: Used for branch flow distribution in sprinkler pipe networks, supporting balanced flow output of each branch to ensure consistent sprinkler performance.
Petrochemical process pipelines: Used for catalyst injection and material distribution in low-pressure process systems, with corresponding material grades selected according to medium corrosion characteristics.
Industrial circulating cooling systems: Used for coolant distribution in data center liquid cooling and factory cooling systems, with stainless steel material providing long-term anti-rust performance.
Sch10S wall thickness fittings are suitable for low to medium pressure pipeline systems. When selecting materials, users should determine the grade based on the medium composition, working temperature and pressure of the specific application. For high-pressure or high-temperature scenarios, higher wall thickness grades or alloy materials are recommended.
The end of the fitting adopts standard bevel preparation, suitable for argon arc welding and other butt welding processes. Before installation, confirm that the outer diameter and wall thickness of the matching pipeline are consistent with the fitting. During welding, symmetrical welding process is recommended to reduce welding deformation and ensure installation coaxiality.
Yes, this straight cross is produced in full accordance with the dimensional requirements and mechanical performance indicators specified in GB/T 12459, and also meets the requirements of multiple international standards such as ASME B16.9.
The maximum working pressure depends on the selected material and working temperature. For 304L material at room temperature, the allowable working pressure is within 60 bar under static pressure conditions. Specific pressure data can be provided according to actual working conditions.
The standard industrial version does not meet sanitary level requirements. Custom electropolished versions with 3-A compliance are available for pharmaceutical and food applications. Please specify the surface finish requirement during procurement.
The main pipe and branch connections should match the corresponding pipe outside diameter, wall thickness and GB/T 12459 dimensional requirements. The material grade and pressure conditions should also be consistent with the rest of the piping system.
Yes. Non-standard main and branch diameter combinations can be evaluated according to customer drawings. Please provide the outside diameters, wall thicknesses, center-to-end dimensions, material grade and operating conditions so that manufacturability can be confirmed.
Yes. The straight cross can be supplied together with matching flanges, elbows, reducers, tees and end caps. All components can be produced according to the same standard and material requirements to reduce installation and connection errors.
Yes. Material certificates and dimensional inspection reports can be supplied according to the order requirements. The material grade and finished dimensions are checked to ensure that the cross meets the agreed piping specification.
