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NXF ASTM A240 316H/1Cr17Ni12Mo2/31609 DN15-1200 Low Pressure Stainless Steel 316L Casting Thread Coupling

2026-08-06 14:40 NXF GROUP
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Product Description
316L Introduce
Grade 316 is the standard molybdenum-bearing grade, second in importance to 304 amongst the austenitic stainless steels. The molybdenum gives 316 better overall corrosion resistant properties than Grade 304, particularly higher resistance to pitting and crevice corrosion in chloride environments.Grade 316L, the low carbon version of 316 and is immune from sensitization (grain boundary carbide precipitation). Thus it is extensively used in heavy gauge welded components (over about 6mm). There is commonly no appreciable price difference between 316 and 316L stainless steel.The austenitic structure also gives these grades excellent toughness, even down to cryogenic temperatures.Compared to chromium-nickel austenitic stainless steels, 316L stainless steel offers higher creep, stress to rupture and tensile strength at elevated temperatures.

316L Casting Thread Coupling Introduce

316L Casting Thread Coupling, also known as investment cast threaded full coupling, is a standard pipe fitting manufactured by precision investment casting. It features female internal threads on both ends to connect two equal-diameter threaded pipes, enabling quick assembly without welding.Made of low-carbon 316L stainless steel, the material contains molybdenum. The low carbon content effectively prevents intergranular corrosion after high-temperature exposure, delivering excellent resistance to acids, alkalis and chloride media such as seawater. Compared with 304, it performs better in corrosive working conditions.This casting fitting complies with MSS SP-114 standard. Its common pressure ratings are Class 150LB, PN16 and PN25. Note: It cannot be marked with 2000#/3000#/6000#, which are pressure grades exclusive for forged threaded fittings per ASME B16.11. Thread options include NPT, BSPP and BSPT. Size ranges from 1/8" to 4".After casting, products go through CNC thread machining, pickling and passivation. Smooth inner surface reduces medium deposition. Widely applied in water treatment, marine, food & beverage, pharmaceutical and general chemical low-to-medium pressure piping systems.It is economical and easy to install, suitable for pipelines requiring regular disassembly. Not recommended for high-pressure, heavy vibration critical service where forged couplings shall be adopted instead.
316L Casting Thread Coupling Drawing
316L Chemical Composition and Mechanical Properties
Factory and Product Pictures
316L Casting Thread Coupling Product Pictures
316L PMI spectral testing proves
Video of a customer visiting us


Product processing

316L Casting Thread Coupling Product Processing

1. Mold & Wax InjectionMake precision molds according to product size. Inject melted wax into the mold to form standard wax patterns of coupling. Repair and polish wax surfaces to ensure dimensional accuracy and smoothness.

2. Shell Making (Investment Casting)Repeat dipping the wax pattern into refractory slurry and sprinkling refractory sand. Build a multi-layer high-strength ceramic shell. Dry the shell completely in a constant temperature and humidity room.

3. Dewax & RoastingPut the shell into a dewaxing kettle to melt and discharge wax, forming a hollow cavity. Roast the shell at high temperature to remove moisture and residual wax, and enhance shell hardness and stability.

4. Casting & SolidificationSmelt 316L stainless steel material and perform composition testing. Pour molten steel into the preheated ceramic shell under controlled temperature. Cool naturally to form casting blank of the coupling.

5. Shell Removal & CuttingCrush and remove the ceramic shell. Clean the casting surface by sand blasting or shot blasting. Cut and remove feeding ports, then grind and trim the blank.

6. Machining & ThreadingFix the blank on CNC lathe. Machine both ends and process internal threads (NPT/BSPT/BSPP) to meet standard requirements. Control thread accuracy and fitting performance.

7. Surface Treatment & InspectionCarry out pickling and passivation to improve corrosion resistance. Conduct visual inspection, dimensional check, thread gauge detection and pressure test. Package qualified products for delivery.

Our NXF GROUP Advantage As Follow:
1.Our NXF GROUP have our own factory, and we can control the cost by producing by ourselves. We have a great advantage in price  and can give you the lowest price based on best quality. 2.Our NXF GROUP can strictly control the quality. We have production, quality inspection, warehousing and other departments to coordinate and control the quality,Such as PMI and size testing. 3.Our NXF GROUP biggest advantage is 3S service. Small quantity, short time, special materials.4.Our NXF GROUP have excellent quality certificate system and trademark certificate 5.Our NXF GROUP have a comprehensive after-sales service guarantee, such as the transaction guarantee provided by Alibaba International Station, as well as remote technical guidance and services. 6.Our NXF GROUP have a well-established logistics support system that can save you both time and money, providing youwith a one-stop service.
Packing & Delivery
Company Profile
New XiFei (SuZhou) Business Co.,Ltd is one of the leading and most respected manufacturers in China. Our products include metals,machinery, containers, construction materials, mechanical products, electrical systems, and medical accessories.Established in1980, XIFEI has been working diligently ever since to embrace the needs of our global customer base.We work to ensure absolute customer satisfaction. Our team has dedicated itself to perfecting our three core components, "Service, Management and Craftsmanship.‘
Our advantage:3S Service(Small Quantity/Short Time/Special Material)
Certification
FAQ
1. who are we?
We are based in Jiangsu, China, start from 2021,sell to South Asia(30.00%),Eastern Asia(10.00%),Mid East(10.00%),Eastern
Europe(10.00%),South America(10.00%),Domestic Market(5.00%),North America(5.00%),Northern Europe(5.00%),Central
America(5.00%),Africa(5.00%),Southeast Asia(5.00%). There are total about 101-200 people in our office.

2. how can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;

3.what can you buy from us?
Pipe,Flange,Steel plate,Pipe fittings,Alloy products

4. why should you buy from us not from other suppliers?
Our advantage:3S Service (Small Quantity/Short Time/Special Material) We have our own factories, quality can be controlled
seriously. We Specialize in manufacturing about 21 years. We have professional testing department and testing equipment.

5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA；
Accepted Payment Currency:USD,EUR,CAD,HKD,CNY;
Accepted Payment Type: T/T,L/C,D/P D/A;
Language Spoken:English,Chinese



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