High-performance Butt-welded Stainless Steel Caps For Boilers, Petrochemical, And Industrial Piping
Stainless steel pipe caps are butt-welded fittings designed to seal pipe ends, offering unmatched corrosion resistance and protection against environmental exposure, debris, and pressure loss.
High-performance Butt-welded Stainless Steel Caps For Boilers, Petrochemical, And Industrial Piping
Stainless steel pipe caps are butt-welded fittings designed to seal pipe ends, offering unmatched corrosion resistance and protection against environmental exposure, debris, and pressure loss. these caps are essential for boiler pipeline protection and erosion/corrosion resistance in industries such as petrochemical, chemical processing, food and beverage, and power generation.
Stainless steel pipe caps are butt-welded fittings designed to seal pipe ends, offering unmatched corrosion resistance and protection against environmental exposure, debris, and pressure loss. These caps are essential for boiler pipeline protection and erosion/corrosion resistance in industries such as petrochemical, chemical processing, food and beverage, and power generation.
Compliant with standards like DIN 2617, ASTM A403, and ASME B16.9, stainless steel pipe caps are available in grades such as 304, 316L, 1.4541, and 1.4571, known for their excellent resistance to corrosive environments. Sizes range from DN15 to DN300 (1/2″ to 48″ for seamless, up to 72″ for welded), with wall thicknesses up to 200 mm (Schedule 5S to SCH 160). Optional surface treatments like pickling or passivation enhance durability in harsh conditions.
These caps undergo rigorous testing, including chemical analysis (e.g., 316L: C ≤0.03%, Cr 16-18%), tensile testing (yield strength ≥205 MPa, tensile strength ≥515 MPa for 316L), hydrostatic testing (up to 9.8 MPa), and nondestructive methods (radiographic, ultrasonic, PMI). With a density of ~8.0 g/cm³ and suitability for temperatures up to 870°C, stainless steel pipe caps are ideal for high-pressure piping systems like boilers, heat exchangers, and offshore pipelines.
The butt-welded design ensures a secure, leak-free seal, making stainless steel pipe caps perfect for terminating pipelines in corrosive environments, such as chemical plants, marine applications, and food processing systems.
| Specification | Details |
|---|---|
| Standards | DIN 2617, ASTM A403, ASME B16.9, EN 10253 |
| Type | Butt-Welded Pipe Cap (Seamless or Welded) |
| Material | Stainless Steel (304, 316L, 1.4541, 1.4571) |
| Size Range | DN15-DN300 (Seamless: 1/2″ to 48″, Welded: 24″ to 72″) |
| Wall Thickness | Up to 200 mm (Schedule 5S to SCH 160) |
| Manufacturing | Seamless Forming, Welded Fabrication, Cold Pressing, Hot Forming |
| Surface Treatment | Pickling, Passivation, Polishing |
| Testing | Chemical Analysis (C ≤0.03% for 316L), Tensile (YS ≥205 MPa, TS ≥515 MPa for 316L), Hydrostatic (≥9.8 MPa), Radiographic, Ultrasonic, PMI |
| Operating Conditions | Pressure: ≥9.8 MPa, Temperature: Up to 870°C |
| Certifications | EN 10204/3.1, ISO 9001, Third-Party Inspection |
| Feature | Stainless Steel Pipe Cap | DIN 2617 Carbon Steel Cap | ASME SA-234 WPB End Cap |
|---|---|---|---|
| Material | Stainless Steel (304, 316L, 1.4541, 1.4571) | Carbon Steel (HII, P235GH) | Carbon Steel (ASME SA-234 WPB) |
| Standard | DIN 2617, ASTM A403, ASME B16.9 | DIN 2617, EN 10253 | ASME SA-234, ASME B16.9 |
| Function | Seals pipe ends, protects against corrosion | Seals pipe ends, protects against corrosion | Seals pipe ends |
| Corrosion Resistance | Excellent (inherent) | Good (with coatings) | Good (with coatings) |
| Erosion Resistance | Excellent (static application) | Good (static application) | Good (static application) |
| Applications | Petrochemical, chemical, food processing, power generation | Boilers, petrochemical, chemical processing | Boilers, petrochemical, chemical processing |
| Temperature Range | Up to 870°C | Up to 450°C | Up to 425°C |
| Cost | Higher | Moderate | Moderate |
| Key Advantage | Superior corrosion resistance | Butt-welded for secure sealing | Cost-effective pipeline sealing |
Inherent resistance to corrosive environments without coatings.
Butt-welded design ensures reliable pipeline termination.
Withstands pressures ≥9.8 MPa in demanding systems.
Reliable up to 870°C for stainless steel.
Seamless integration with stainless steel systems.
Ideal for food and pharmaceutical applications.
A curated list of long-tail keywords for stainless steel pipe caps, covering standards, materials, and industrial applications.
Note: Stainless steel pipe caps are engineered for corrosion-resistant, high-pressure pipeline sealing in critical industrial applications. Contact a certified supplier for detailed specifications.
Standards: ASME B16.9 and ASME B16.25
Description: Designed for butt welding to pipe end, providing permanent and strong connection.
Standards: ASME B16.11
Description: Fit into socket of pipe fitting and welded in place.
Thread Types: NPT and BSP configurations
Description: Feature internal or external threads for screwing onto threaded pipe ends.
Features: Flange, slotted head, knurled or faceted head options
Considerations: Length and width dimensions are critical
Design: Dome-shaped for optimal pressure distribution
| Grade | C (% max) | Mn (% max) | Si (% max) | P (% max) | S (% max) | Cr (%) | Ni (%) | Mo (%) | N (% max) |
|---|---|---|---|---|---|---|---|---|---|
| 304 | 0.08 | 2.00 | 1.00 | 0.045 | 0.030 | 18.0-20.0 | 8.0-11.0 | - | 0.10 |
| 304L | 0.03 | 2.00 | 1.00 | 0.045 | 0.030 | 18.0-20.0 | 8.0-12.0 | - | 0.10 |
| 316 | 0.08 | 2.00 | 1.00 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 | 0.10 |
| 316L | 0.03 | 2.00 | 1.00 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 | 0.10 |
The low carbon content in 304L and 316L enhances weldability, while molybdenum in 316 and 316L improves resistance to pitting and crevice corrosion, making Stainless Steel Pipe Caps ideal for harsh environments.
| Grade | Tensile Strength (min, MPa) | Yield Strength (min, MPa) | Elongation (min, %) | Hardness (max, HB) | Hardness (max, HRB) |
|---|---|---|---|---|---|
| 304 | 515 | 205 | 40 | 201 | 92 |
| 304L | 485 | 170 | 40 | 201 | 92 |
| 316 | 515 | 205 | 40 | 217 | 95 |
| 316L | 485 | 170 | 40 | 217 | 95 |
These mechanical properties make Stainless Steel Pipe Caps suitable for applications requiring high strength and corrosion resistance, such as architectural structures, marine environments, and chemical processing.
In order to solve the cumbersome and difficult to remember stainless steel grades, improve the practicability of the brand representation, and the contrast with the international standard grades, China has formulated the "Universal Code System for Steel and Alloy Grades", such as 06Cr19Ni10, corresponding to 304. Different grades of stainless steel have different ingredients, but they all have a national standard. The standards of each country are also different.
| No | China (GB) | Japan (JIS) | American | Korea (KS) | EU (BS EN) | India (IS) | Australia (AS) | Taiwan (CNS) | ||
|---|---|---|---|---|---|---|---|---|---|---|
| Old | New (07.10) | SUS | ASTM | UNS | STS | EN | IS | AS | CNS | |
| Austenitic Stainless Steel | ||||||||||
| 1 | 1Cr17Mn6Ni5N | 12Cr17Mn6Ni5N | SUS201 | 201 | S20100 | STS201 | 1.4372 | 10Cr17Mn6Ni4N20 | 201-2 | 201 |
| 2 | 1Cr18Mn8Ni5N | 12Cr18Mn9Ni5N | SUS202 | 202 | S20200 | STS202 | 1.4373 | — | — | 202 |
| 3 | 1Cr17Ni7 | 12Cr17Ni7 | SUS301 | 301 | S30100 | STS301 | 1.4319 | 10Cr17Ni7 | 301 | 301 |
| 4 | 0Cr18Ni9 | 06Cr19Ni10 | SUS304 | 304 | S30400 | STS304 | 1.4301 | 07Cr18Ni9 | 304 | 304 |
| 5 | 00Cr19Ni10 | 022Cr19Ni10 | SUS304L | 304L | S30403 | STS304L | 1.4306 | 02Cr18Ni11 | 304L | 304L |
| 6 | 0Cr19Ni9N | 06Cr19Ni10N | SUS304N1 | 304N | S30451 | STS304N1 | 1.4315 | — | 304N1 | 304N1 |
| 7 | 0Cr19Ni10NbN | 06Cr19Ni9NbN | SUS304N2 | XM21 | S30452 | STS304N2 | — | — | 304N2 | 304N2 |
| 8 | 00Cr18Ni10N | 022Cr19Ni10N | SUS304LN | 304LN | S30453 | STS304LN | — | — | 304LN | 304LN |
| 9 | 1Cr18Ni12 | 10Cr18Ni12 | SUS305 | 305 | S30500 | STS305 | 1.4303 | — | 305 | 305 |
| 10 | 0Cr23Ni13 | 06Cr23Ni13 | SUS309S | 309S | S30908 | STS309S | 1.4833 | — | 309S | 309S |
| 11 | 0Cr25Ni20 | 06Cr25Ni20 | SUS310S | 310S | S31008 | STS310S | 1.4845 | — | 310S | 310S |
| 12 | 0Cr17Ni12Mo2 | 06Cr17Ni12Mo2 | SUS316 | 316 | S31600 | STS316 | 1.4401 | 04Cr17Ni12Mo2 | 316 | 316 |
| 13 | 0Cr18Ni12Mo3Ti | 06Cr17Ni12Mo2Ti | SUS316Ti | 316Ti | S31635 | — | 1.4571 | 04Cr17Ni12MoTi20 | 316Ti | 316Ti |
| 14 | 00Cr17Ni14Mo2 | 022Cr17Ni12Mo2 | SUS316L | 316L | S31603 | STS316L | 1.4404 | 02Cr17Ni12Mo2 | 316L | 316L |
| 15 | 0Cr17Ni12Mo2N | 06Cr17Ni12Mo2N | SUS316N | 316N | S31651 | STS316N | — | — | 316N | 316N |
| 16 | 00Cr17Ni13Mo2N | 022Cr17Ni13Mo2N | SUS316LN | 316LN | S31653 | STS316LN | 1.4429 | — | 316LN | 316LN |
| 17 | 0Cr18Ni12Mo2Cu2 | 06Cr18Ni12Mo2Cu2 | SUS316J1 | — | — | STS316J1 | — | — | 316J1 | 316J1 |
| 18 | 00Cr18Ni14Mo2Cu2 | 022Cr18Ni14Mo2Cu2 | SUS316J1L | — | — | STS316J1L | — | — | — | 316J1L |
| 19 | 0Cr19Ni13Mo3 | 06Cr19Ni13Mo3 | SUS317 | 317 | S31700 | STS317 | — | — | 317 | 317 |
| 20 | 00Cr19Ni13Mo3 | 022Cr19Ni13Mo3 | SUS317L | 317L | S31703 | STS317L | 1.4438 | — | 317L | 317L |
| 21 | 0Cr18Ni10Ti | 06Cr18Ni11Ti | SUS321 | 321 | S32100 | STS321 | 1.4541 | 04Cr18Ni10Ti20 | 321 | 321 |
| 22 | 0Cr18Ni11Nb | 06Cr18Ni11Nb | SUS347 | 347 | S34700 | STS347 | 1.4550 | 04Cr18Ni10Nb40 | 347 | 347 |
| Austenitic-Ferritic Stainless Steel (Duplex) | ||||||||||
| 23 | 0Cr26Ni5Mo2 | — | SUS329J1 | 329 | S32900 | STS329J1 | 1.4477 | — | 329J1 | 329J1 |
| 24 | 00Cr18Ni5Mo3Si2 | 022Cr19Ni5Mo3Si2N | SUS329J3L | — | S31803 | STS329J3L | 1.4462 | — | 329J3L | 329J3L |
| Ferritic Stainless Steel | ||||||||||
| 25 | 0Cr13Al | 06Cr13Al | SUS405 | 405 | S40500 | STS405 | 1.4002 | 04Cr13 | 405 | 405 |
| 26 | — | 022Cr11Ti | SUH409 | 409 | S40900 | STS409 | 1.4512 | — | 409L | 409L |
| 27 | 00Cr12 | 022Cr12 | SUS410L | — | — | STS410L | — | — | 410L | 410L |
| 28 | 1Cr17 | 10Cr17 | SUS430 | 430 | S43000 | STS430 | 1.4016 | 05Cr17 | 430 | 430 |
| 29 | 1Cr17Mo | 10Cr17Mo | SUS434 | 434 | S43400 | STS434 | 1.4113 | — | 434 | 434 |
| 30 | — | 022Cr18NbTi | — | — | S43940 | — | 1.4509 | — | 439 | 439 |
| 31 | 00Cr18Mo2 | 019Cr19Mo2NbTi | SUS444 | 444 | S44400 | STS444 | 1.4521 | — | 444 | 444 |
| Martensitic Stainless Steel | ||||||||||
| 32 | 1Cr12 | 12Cr12 | SUS403 | 403 | S40300 | STS403 | — | — | 403 | 403 |
| 33 | 1Cr13 | 12Cr13 | SUS410 | 410 | S41000 | STS410 | 1.4006 | 12Cr13 | 410 | 410 |
| 34 | 2Cr13 | 20Cr13 | SUS420J1 | 420 | S42000 | STS420J1 | 1.4021 | 20Cr13 | 420 | 420J1 |
| 35 | 3Cr13 | 30Cr13 | SUS420J2 | — | — | STS420J2 | 1.4028 | 30Cr13 | 420J2 | 420J2 |
| 36 | 7Cr17 | 68Cr17 | SUS440A | 440A | S44002 | STS440A | — | — | 440A | 440A |
Prevents entry of dirt, debris, and contaminants into piping systems
Provides reliable sealing for both liquid and gas applications
Suitable for various industries and pipe materials
Various head designs for easy handling and installation
Made from single steel plate for superior integrity
Options for permanent or temporary installation
Pipeline terminations, wellhead applications, refinery piping
Process piping systems, chemical storage and handling
Steam and water systems, cooling circuits, fuel handling
Building services piping, HVAC systems, fire protection
Ship piping systems, offshore installations, marine equipment
Hygienic piping systems, processing equipment, sterile systems
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