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NXF UNS S31603/1.4404/SUS316L Diameter 1-100mm Grade 100-450HV Stainless Steel Fastener 316L Octagonal Gasket
2026-10-29 19:34 NXF GROUP
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Products Description
316L Introduction
SAE 316L stainless steel is an austenitic stainless steel and the second most common stainless steel after SAE 304 stainless steel. Its primary alloying constituents after iron are chromium (16–18%), nickel (10–12%), and molybdenum (2–3%). Up to 2% manganese and small (<1%) quantities of silicon, phosphorus, and sulfur are also present. The addition of molybdenum provides greater corrosion resistance than 304, with respect to localized corrosive attack by chlorides, hydrogen embrittlement and to general corrosion by reducing acids, and other acids such as sulfuric acid;while sulfur is added to improve ease-of-tooling/machinability. 316L grade is the low carbon version of 316 stainless steel, which improves relative corrosion-resistance. When cold worked, 316 can produce high yield and tensile strengths similar to duplex stainless steel grades.
It is commonly used in chemical and petrochemical industry, in food processing, pharmaceutical equipment, medical devices, jewellery, luxury watches (especially diver's watches), in potable water piping,wastewater treatment,in marine applications and architectural applications near the seashore or in urban areas.
It is commonly used in chemical and petrochemical industry, in food processing, pharmaceutical equipment, medical devices, jewellery, luxury watches (especially diver's watches), in potable water piping,wastewater treatment,in marine applications and architectural applications near the seashore or in urban areas.
316L Octagonal Gasket Introduction
The 316L Octagonal Gasket is a premium metal sealing component manufactured from 316L stainless steel, featuring a standard octagonal cross-section. It delivers reliable metal-to-metal sealing performance under high pressure and high-temperature working conditions. This gasket offers excellent corrosion resistance, oxidation resistance and good mechanical stability, suitable for flanged connections on pipelines, pressure vessels, valves and instrumentation equipment. It conforms to international flange sealing standards, can withstand harsh media including acid, alkali and steam, and is widely used in oil & gas, chemical, power and petrochemical industries. Precision machining ensures consistent surface finish and tight fit with flange grooves to prevent leakage for long-term service.
316L Octagonal Gasket Drawing
316L Chemical Composition And Mechanical Properties
Factory and Product Pictures
316L Octagonal Gasket Product Pictures
316L PMI spectral testing proves
Video of a customer visiting us
Product processing
316L Octagonal Gasket Product Processing
1.Raw Material Inspection:
The raw material is ASTM A182 F316L stainless steel solid round bar. Upon arrival, we carry out a full incoming inspection: perform spectrometer chemical composition analysis to confirm it meets 316L low-carbon stainless steel requirements; conduct tensile and hardness testing to verify mechanical properties; visually check for cracks, porosity, inclusions and surface scratches; measure bar diameter and straightness. Any non-conforming material will be marked, isolated and returned to the supplier to prevent mixing into production.
2.Saw Cutting & Hot Forging:
3.CNC Rough Turning:
4.Vacuum Stress Relief Heat Treatment:
5.CNC Finishing & Octagonal Profile Machining:
6.Final Inspection, Ultrasonic Cleaning & Packaging:
2.Saw Cutting & Hot Forging:
Use a band saw to cut the qualified round bar into single blanks with extra machining allowance. Transfer blanks to the heating furnace and heat to the specified forging temperature range. Carry out closed-die hot forging to form rough annular blanks, strictly control forging pressure and deformation rate to refine internal grain structure and improve material compactness. After forging, air cool the ring blank to room temperature, then straighten to correct ovality and warping caused by forging stress.
3.CNC Rough Turning:
Secure the forged ring blank on a CNC lathe fixture. Rough-turn the inner diameter, outer diameter and two end faces, uniformly reserve finishing tolerance allowance for subsequent precision machining. Remove oxide scale, forging flash and obvious surface defects. After rough machining, clean off cutting chips and coolant residue for the next process.
4.Vacuum Stress Relief Heat Treatment:
Load the rough-machined ring blanks into a vacuum heat treatment furnace to perform stress relief annealing. The vacuum environment avoids surface oxidation and discoloration. This process eliminates residual stress generated during forging and rough turning, effectively preventing size distortion and sealing profile deformation in the follow-up finishing and service. After heat treatment, the blanks are slowly cooled inside the furnace.
5.CNC Finishing & Octagonal Profile Machining:
Clamp the stress-relieved blank for precision finishing. Finish-turn inner diameter, outer diameter and end faces to drawing tolerance. Machine the standard octagonal sealing groove profile in strict accordance with ASME B16.20 standard, precisely control the sealing surface angle, width, parallelism and concentricity. After turning, perform fine grinding and buffing on the two octagonal sealing surfaces to reach required surface roughness, ensuring tight metal-to-metal sealing performance under high pressure.
6.Final Inspection, Ultrasonic Cleaning & Packaging:
Carry out 100% dimensional inspection with calipers, micrometers and profile gauge; check surface roughness, hardness and visual appearance for burrs, scratches or dents. Qualified gaskets go through ultrasonic degreasing cleaning to remove cutting oil, fine metal chips and dirt, then fully dried in a dust-free area. Wrap each gasket with anti-rust paper, place into sealed packaging box with desiccant, label part number, material, batch number and inspection mark to avoid scratches, corrosion and contamination before 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 you with a one-stop service.
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 you with a one-stop service.
Packing & Delivery
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:
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:
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 you with a one-stop service.
5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA,DDP,DDU；
Accepted Payment Currency:USD,EUR,CAD,HKD,CNY;
Accepted Payment Type: T/T,L/C,D/P D/A,Credit Card,PayPal;
Language Spoken:English,Chinese,Spanish,Russian
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 you with a one-stop service.
5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA,DDP,DDU；
Accepted Payment Currency:USD,EUR,CAD,HKD,CNY;
Accepted Payment Type: T/T,L/C,D/P D/A,Credit Card,PayPal;
Language Spoken:English,Chinese,Spanish,Russian
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