Stainless steel pipe supplier - GNEE
GNEE's products are exported to 150 countries and regions worldwide, with annual export value reaching 500 million RMB.
Production Capacity
For seamless and precision stainless steel tubes, GNEE is equipped with multiple high-precision cold rolling mills, enabling the production of precision tubes with extremely tight tolerances.
For large-diameter pipes, industrial fluid pipes, and decorative tubes, GNEE operates fully automated welding production lines.
We offer a wide range of value-added services, including machining, bending, coating, heat treatment, cutting, drilling, chamfering, tempering, and surface finishing.
Product Certifications
The company has passed ISO9001 international quality management system certification and has obtained 8 quality system certifications, including provincial enterprise credit certificates, enterprise credit certificates, quality service certificates, and integrity management demonstration unit certifications. Products conform to GB, ASTM, JIS, DIN, and other standards.
Main stainless steel pipe types
Stainless Steel Tubes include Austenitic Stainless Steel Tubes, Super Austenitic Stainless Steel Tubes, Ferrite-Austenite Duplex Stainless Steel Tubes, Ni-Alloy Tubes, can be used as Gauge Pipes, Heat Exchanger Pipes, Boiler Pipes, Marine Pipes, Petrochemical Pipes.
Standards for stainless steel pipes
GB/T14976-2012 Stainless steel seamless steel pipes for fluid transportation
GB/T14975-2012 Stainless steel seamless steel pipes for structural use (replacing GB/T14975-2002)
GB13296-2013 Stainless steel tubes for boiler tubes and heat exchangers
(GJB2608-96) (YB676-73) Aviation structural pipes, thick-walled seamless steel pipes
(GJB2296-95) (YB678-71) Stainless steel pipe for aviation
(YB/T679-97) (YB679-71) 18A hollow rivet thin-walled seamless steel pipe for aviation
GB3090-2000 small diameter stainless steel pipe
GB5310-2017 Seamless steel pipe for high-pressure boilers
GB3087-2008 low and medium pressure boiler tubes
GB3089-2008 Stainless acid-resistant extremely thin-walled seamless steel pipe
GB9948-2013 Seamless steel for petroleum cracking
ASTM A213 Ferritic and austenitic alloy tubes for boilers and heat exchangers
ASTM A269 General Purpose Austenitic Stainless Steel Pipe and Welded Pipe
ASTM A312 austenitic stainless steel seamless steel pipe welded steel pipe welded pipe
ASTM A450 General Requirements for Carbon, Ferritic and Austenitic Alloy Steel Pipe
ASTM A530 General Requirements for Ferrous and Alloy Steels for Special Purposes
ASTM A789 General Requirements for Carbonitic Austenitic Stainless Steel Seamless and Welded Steel Pipe
JIS G3456-88 Stainless steel pipes for mechanical structures
JIS G3448-88 Stainless steel pipes for ordinary pipes
JIS G3459-88 Stainless steel pipes for pipelines
JIS G3463-88 Stainless steel tubes for boilers and heat exchangers
| PRODUCT NAME | STANDARD | GRADE | SIZE RANGE OD. |
USAGE |
| Stainless Steel Seamless tubes and pipes | ASME/ASTM SA/A213 | TP304, TP304L, TP304H, TP310S, TP310H, TP316, TP316L, TP316Ti, TP321, TP321H, TP347, TP347H,TP410, TP430, S31254, S31803, S32205, S32750, N08800, N08810, N8825, LC30-1812 LC65-2205 | 1/4 inch to 32 inch | Heat Exchanger and Condenser, Boiler |
| ASME/ASTM SA/A269 | 6.35mm to 813mm | |||
| ASME/ASTM SA/A312 | 6.35mm to 813mm | |||
| ASME/ASTM SA/A789 | 6.35mm to 813mm | |||
| ASME/ASTM SA/A790 | 6.35mm to 813mm | |||
| ASME/ASTM SA/A270 | 6.35mm to 219mm | Food Hygiene Grade | ||
| JIS G3463, JIS G3459 | SUS304, SUS316, SUS321 | 6mm to 340mm | Heat Exchanger and Condenser, Boiler and others | |
| DIN17456, DIN17457, DIN17458, DIN17459, DIN28280 | 1.4301, 1.4307, 1.4948, 1.4541, 1.4878, 1.4550… | 6mm to 340mm | ||
| Stainless Steel Welded tubes and pipes | ASME/ASTM SA/A249 | TP304, TP304L, TP304H, TP310S, TP310H, TP316, TP316L, TP316Ti, TP321, TP321H, TP347, TP347H, S31803, S32205, S32750, N08094 | 10mm to 2500mm | Heat Exchanger and Condenser, Boiler and others |
| ASME/ASTM SA/A269 | 10mm to 2500mm | |||
| ASME/ASTM SA/A312 | 10mm to 2500mm | |||
| ASME/ASTM SA/A789 | 10mm to 2500mm | |||
| ASME/ASTM SA/A790 | 10mm to 2500mm | |||
| EN10217-7 | 1.4301, 1.4306, 1.4307, 1.4401, 1.4404 | 10mm to 2500mm |
Stainless Steel Pipe Material Grades
| China GB/T20878-2007 | USA ASTM A959-2004 | Japan JIS G4303-1998 JIS G4311-1991 | internationality ISO/TS15510-2003 ISO 4955-2005 | Europe EN10088:1-1995 EN 10095-1995 | Former Soviet Union r〇CT 5632-1972 | ||
| New grades | Old brand | ||||||
| 15Cr17Mn6Ni5N | 1Cr17Mn6Ni5N | S20100, 201 | SUS201 | X12CrMnNiN17—7—5 | X12CrMnNiN17—7—5,1.4372 | — | |
| 15Cr17Ni7 | 1Cr17Ni7 | S30100, 301 | SUS301 | X10CrNi18-8 | X10CrNi18—8， 1.4310 | — | |
| 03Cr17Ni7 | S30103, 301L | SUS301L | |||||
| 08Cr19Ni9 | 0Cr18Ni9 | S30400，304 | SUS304 | X5CrNi18-10 | X5CrNi18-10 | — | |
| 03Cr19Ni10 | 00Cr19Ni10 | S30403, 304L | SUS304L | X2CrNi19-11 | X2CrNi19-11 | 03X18H11 | |
| 03Crl9Nil0N | 00Cr18Ni10N | S30453， 304LN | SUS304LN | X2CrNiN18-9 | X2CrNiN18-10，1.4311 | – | |
| 08Cr23Ni13 | 0Cr23Ni13 | S30908， 309S | SUS309S | X12CrNi23-13 | X12CrNi23-13，1.4833 | 10X23H13 | |
| 25Cr25Ni20 | 2Cr25Ni20 | S31000， 310 | SUH310 | X15CrNi25-21 | X15CrNi25-21，1.4821 | 20X25H20C2 | |
| 08Cr25Ni20 | 0Cr25Ni20 | S31008， 310S | SUS310S | X8CrNi25-21 | X8CrNi25-21， 1.4845 | 08X23H18 | |
| 08Cr17Ni12Mo2 | 0Cr17Ni12Mo2 | S31600， 316 | SUS316 | X5CrNiMo17-12-2 | X5CrNiMo17-12-2， 1.4401 | – | |
| 03Cr17Ni12Mo2 | 00Cr17Ni14Mo2 | S31603， 316L | SUS316L | X2CrNiMo17-12-2 | X2CrNiMo17-12-2， 1.4404 | 03X17H14M2 | |
| 07Cr17Ni12Mo2 | 1Cr17Ni12Mo2 | S31609， 316H | – | – | X3CrNiMo17-13-3， 1.4436 | – | |
| 08Crl7Nil2Mo2Ti | 0Cr18Ni12Mo2Ti | S31635， 316Ti | SUS316Ti | X6CrNiMoTi17-12-2 | X6CrNiMoTi17-12-2, 1.4571 | 08X17H13M3T | |
| 08Cr17Ni12Mo2N | 0Cr17Ni12Mo2N | S31651， 316N | SUS316N | – | – | – | |
| 03Cr17Ni12Mo2N | 00Cr17Ni13Mo2N | S31653， 316LN | SUS316LN | X2CrNiMoN17-12-3 | X2CrNiMoN17-13-3, 1.4429 | – | |
| 08Cr19Ni13Mo4 | 0Cr19Ni13Mo3 | S31700， 317 | SUS317 | – | – | – | |
| 03Cr19Ni13Mo4 | 00Cr19Ni13Mo3 | S31703， 317L | SUS317L | X2CrNiMo19-14-4 | X2CrNiMo18-15-4, 1.4438 | 03X16H15M3 | |
| 08Cr18Ni10Ti | 0Cr18Ni10Ti | S32100,321 | SUS321 | X6CrNiTi18-10 | X6CrNiTi18-10, 1.4541 | 08X18H10T | |
| 08Cr18Ni11Nb | 0Cr18Ni11Nb | S34700， 347 | SUS347 | X6CrNiNb18-10 | X6CrNiNb18-10, 1.4550 | 08X18H12Б | |
| 03Cr22Ni5Mo3N | S31803 | SUS329J3L | X2CrNiMoN22-5-3 | X2CrNiMoN22-5-3， 1.4462 | – | ||
| 04Cr26Ni6Mo3Cu2N | S32550, 255 | SUS329J4L | X2CrNiMoCuN25-6-3 | X2CrNiMoCuN25-6-3， 1.4507 | – | ||
| 03Cr25Ni7Mo4N | S32750, 2507 | – | X2CrNiMoN25-7-4 | X2CrNiMoN25-7-4， 1.4410 | – | ||
| 08Cr11Ti | 0Cr11Ti | S40900 | SUH409 | X6CrTi12 | – | – | |
| 03Cr11Ti | S40920 | SUH409L | X2CrTi12 | X2CrTi12，1.4512 | – | ||
| 03CrllNbTi | S40930 | — | — | — | — | ||
| 08Cr13 | 0Cr13 | S41008, 410S | SUS410S | X6Cr13 | X6Cr13, 1.4000 | 08X13 | |
| 12Cr15 | 1Cr15 | S42900, 429 | SUS429 | — | — | — | |
| 12Cr17d | 1Cr17 | S43000 | SUS430 | X6Cr17 | X6Cr17, 1.4016 | 12X17 | |
| Y12Cr17 | Y1Cr17 | S43020, 430F | SUS430F | X7CrS17 | X14CrMoS17, 1.4104 | — | |
| 03Cr18Mo2NbTi | 00Cr18Mo2 | S44400, 444 | SUS444 | X2CrMoTi18—2 | X2CrMoTi18—2, 1.4521 | — | |
| 15Cr13 | 1Cr13 | S41000, 410 | SUS410 | X12Cr13 | X12Cr13, 1.4006 | 12X13 | |
| Y15Cr13 | Y1Cr13 | S41600, 416 | SUS416 | X12CrS13 | X12CrS13, 1.4005 | — | |
| 21Cr13 | 2Cr13 | S42000, 420 | SUS420J1 | X20Cr13 | X20Cr13, 1.4021 | 20X13 | |
| 31Cr13 | 3Cr13 | S42000, 420 | SUS420J2 | X30Cr13 | X30Cr13, 1.4028 | 30X13 | |
| 68Cr17 | 7Cr17 | S44002, 440A | SUS440A | — | — | — | |
| 85Cr17 | 8Cr17 | S44003, 440B | SUS440B | — | — | — | |
| 108Cr17 | 11Cr17 | S44004, 440C | SUS440C | X105CrMo17 | X105CrMo17, 1.4125 | — | |
| Y108Cr17 | Y11Cr17 | S44020, 440F | SUS440F | — | — | — | |
| 108Cr17Mo | 9Cr18Mo | S44004, 440C | SUS440C | X105CrMo17 | X105CrMo17, 1.4125 | — | |
| 90Cr18MoV | 9Cr18MoV | S44003, 440B | SUS440B | — | X90CrMoV18, 1.4112 | — | |
Stainless Steel Pipe Dimensions Chart (ASME B36.19)
| NPS (inch) | DN (mm) | Outside Diameter (OD) (inch) | Outside Diameter (OD) (mm) | Sch 5S (mm) | Sch 10S (mm) | Sch 40S (mm) | Sch 80S (mm) |
| 1/8" | DN6 | 0.405 | 10.3 | - | 1.24 | 1.73 | 2.41 |
| 1/4" | DN8 | 0.540 | 13.7 | 0.89 | 1.65 | 2.24 | 3.02 |
| 3/8" | DN10 | 0.675 | 17.1 | 1.24 | 1.65 | 2.31 | 3.20 |
| 1/2" | DN15 | 0.840 | 21.3 | 1.65 | 2.11 | 2.77 | 3.73 |
| 3/4" | DN20 | 1.050 | 26.7 | 1.65 | 2.11 | 2.87 | 3.91 |
| 1" | DN25 | 1.315 | 33.4 | 1.65 | 2.77 | 3.38 | 4.55 |
| 1-1/4" | DN32 | 1.660 | 42.2 | 1.65 | 2.77 | 3.56 | 4.85 |
| 1-1/2" | DN40 | 1.900 | 48.3 | 1.65 | 2.77 | 3.68 | 5.08 |
| 2" | DN50 | 2.375 | 60.3 | 1.65 | 2.77 | 3.91 | 5.54 |
| 2-1/2" | DN65 | 2.875 | 73.0 | 2.11 | 3.05 | 5.16 | 7.01 |
| 3" | DN80 | 3.500 | 88.9 | 2.11 | 3.05 | 5.49 | 7.62 |
| 4" | DN100 | 4.500 | 114.3 | 2.11 | 3.05 | 6.02 | 8.56 |
| 5" | DN125 | 5.563 | 141.3 | 2.77 | 3.40 | 6.55 | 9.53 |
| 6" | DN150 | 6.625 | 168.3 | 2.77 | 3.40 | 7.11 | 10.97 |
| 8" | DN200 | 8.625 | 219.1 | 2.77 | 3.76 | 8.18 | 12.70 |
| 10" | DN250 | 10.750 | 273.1 | 3.40 | 4.19 | 9.27 | 12.70 |
| 12" | DN300 | 12.750 | 323.9 | 3.96 | 4.57 | 9.53 | 12.70 |
Refer Stainless Steel Pipe Weight Formula
Weight (kg/m) = (OD − WT) × WT × 0.02491
OD = Outside Diameter (mm)
WT = Wall Thickness (mm)
0.02491 = Density factor (based on 304 stainless steel density ~7.93 g/cm³)
Example:
For a 304 stainless steel pipe with:
OD = 60.3 mm
WT = 3.91 mm
Weight = (60.3 − 3.91) × 3.91 × 0.02491 ≈ 5.49 kg/m
Pressure Rating Tables for Stainless Steel Pipe
Assumptions:
Material: ASTM A312 TP304 / TP316 / TP316L
Schedule: SCH 40S
Design Factor: 1.0
Units: MPa / psi
Source Reference: ASME B31.3, ASTM A312
| Nominal Pipe Size (NPS) | Outside Diameter (mm) | Wall Thickness (mm) | Schedule | Allowable Pressure @100°F (38°C) | Allowable Pressure @400°F (204°C) |
|---|---|---|---|---|---|
| 1/2" | 21.3 | 2.77 | 40S | 17.2 MPa / 2,500 psi | 13.8 MPa / 2,000 psi |
| 3/4" | 26.7 | 2.87 | 40S | 15.9 MPa / 2,300 psi | 12.4 MPa / 1,800 psi |
| 1" | 33.4 | 3.38 | 40S | 14.5 MPa / 2,100 psi | 11.0 MPa / 1,600 psi |
| 1-1/2" | 48.3 | 3.68 | 40S | 12.4 MPa / 1,800 psi | 9.0 MPa / 1,300 psi |
| 2" | 60.3 | 3.91 | 40S | 11.0 MPa / 1,600 psi | 8.3 MPa / 1,200 psi |
| 3" | 88.9 | 5.49 | 40S | 10.3 MPa / 1,500 psi | 7.6 MPa / 1,100 psi |
| 4" | 114.3 | 6.02 | 40S | 9.7 MPa / 1,400 psi | 7.0 MPa / 1,000 psi |
| 6" | 168.3 | 7.11 | 40S | 8.6 MPa / 1,250 psi | 6.2 MPa / 900 psi |
| 8" | 219.1 | 8.18 | 40S | 7.6 MPa / 1,100 psi | 5.5 MPa / 800 psi |
| 10" | 273.0 | 9.27 | 40S | 6.9 MPa / 1,000 psi | 5.0 MPa / 725 psi |
| 12" | 323.8 | 9.53 | 40S | 6.2 MPa / 900 psi | 4.5 MPa / 650 psi |
application of Stainless Steel Pipe
Stainless steel pipes for chemical industry
Stainless Steel Mechanical Tube
stainless steel handrail tube
Food grade stainless steel pipe
marine stainless steel tubing
Quality Inspection
Spectroscopic Analysis (PMI/Spectrometer): Utilizes handheld or benchtop spectrometers.
Tensile Test: Measures tensile strength, yield strength, and elongation.
Hardness Test: Commonly employs Rockwell (HRC/HRB), Brinell (HB), or Vickers (HV) hardness testing.
Flattening Test: Flattens the tubing to a specified distance to check for cracks in the weld seam or base material.
Flaring Test: Expands the tube opening to a specified percentage to check for cracks along the rim.
Bending Test: Performed on small-diameter tubing to assess its flexibility.
Hydrostatic Test: Every fluid-carrying tube must undergo either a Hydrostatic Test or a pneumatic leak test.
Eddy Current Testing (ET): Detects minute cracks on the surface and in the near-surface zone.
Ultrasonic Testing (UT): Detects inclusions and laminations within the tube wall.
Hydrostatic Test
Flaring Test
Ultrasonic Testing (UT)
Spectroscopic Analysis
304, 316, 310S Stainless Steel Pipe Manufacturer
We supply stainless steel pipes in compliance with international standards such as ASTM A312, A213, A269, and EN 10216-5. Our products are certified with ISO 9001, PED (Pressure Equipment Directive), and CE, ensuring full compliance in global markets.
In addition, customers do not need to perform on-site cutting. We provide value-added processing services such as fixed length cutting, beveling, and drilling, helping reduce on-site workload and minimize material waste during installation.
Stock Availability: 3–7 working days.
For commonly used international standard specifications (such as ASTM A312, Sch 10S/40S/80S), GNEE maintains a large inventory:
304/304L: Largest stock volume available. Lifting and loading can be arranged on the same day, with export packing completed within 3 days and shipment to port.
316/316L: Standard sizes (1/2" to 12") are readily available in stock, with shipment preparation completed within 5 days.
310S: Regular industrial sizes (commonly used for heat-resistant boilers and heat exchangers) are kept in stock and can be shipped within 7 days.
High-Quality Sea Freight Packaging and Transport
End Protection: All pipes are supplied with plastic caps on both ends as standard.
Depending on pipe diameter, wall thickness, and transportation distance, GNEE provides the following packaging options:
A. Bundled Packing
Application: Large quantities and medium-to-large diameter industrial pipes.
Details: Pipes are tightly arranged in hexagonal or circular bundles and securely fastened with steel strips. Protective materials such as cardboard or plastic strips are placed at strapping points to prevent surface damage.
B. Wooden Case / Crate Packing
Application: Thin-walled pipes, small-diameter precision tubes, high-grade alloy pipes (such as 310S, 2205), or polished tubes.
Details: Fumigated wooden cases compliant with international standards are used. The interior is filled with foam or equipped with support frames to prevent movement during transportation.
C. Woven Bag Wrapping
Application: Bundled pipes requiring additional protection against dust and salt spray.
Details: Based on bundled packing, an outer layer of waterproof woven fabric or wrapping is applied to provide secondary physical protection.
FAQ
Q:What is the difference between 304 and 316 stainless steel pipes?
Q: What is "Schedule" (e.g., Sch 40, Sch 80)?
Q:Can stainless steel pipes be welded?
Q: Q: What is the difference between stainless steel seamless pipes and stainless steel welded pipes?
Q: Are stainless steel pipes suitable for cryogenic or low temperature environments?
Q: What does the L after the stainless steel type mean?
The "L" indicates that the stainless steel alloy has a reduced carbon content compared to the standard grade. Low carbon stainless steel offers several benefits: improved weldability, reduced corrosion susceptibility, and maintained corrosion resistance.
While L-grade stainless steels offer enhanced corrosion resistance and weldability, they may cost slightly more than non-L-grade stainless steels.
Q: What is stainless steel pipe used for?
Q: Is stainless steel pipe rust-proof?
A: Stainless steel pipes are highly corrosion-resistant but not completely rust-proof. In harsh chloride or acidic environments, proper grade selection (like 316L) is essential.
Q: Do we need to maintain stainless steel pipes regularly?
Q: What forms do you have of stainless steel?
Gnee Steel (Tianjin) Co., Ltd. is well-known as one of the leading stainless steel pipe manufacturers and suppliers in China. Our factory offers customized stainless steel pipe made in China with competitive price. Welcome to contact us for wholesale service.
Aisi 201 Stainless Steel Pipe, G 30 G 35 Special Sheets, 201 Rectangle Stainless Steel Pipe