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The grade 304L can be used in mild chemicals with less acidity and less oxidation and reduction capacity. Food and beverages industries often deal with mild acids like carbonic acids, citric acid and tartaric acids. These are found in food items and are mild acids that do not corrode the 304L Pipe. The material has 18% chromium and 8% nickel along with other additions but with less carbon than the ordinary SS304 Pipe material.
304L is a variant of 304 stainless steel with lower carbon content and is used where welding is required. The lower carbon content minimizes the precipitation of carbides in the heat-affected zone near the weld, and the precipitation of carbides may cause stainless steel to produce intergranular corrosion (welding erosion) in certain environments.
304L stainless steel has poor forging performance and difficult deformation.
Due to work hardening. So that the amount of deformation in the process of mandrel drawing can not be too large. And the heat loss is large. Therefore, it must be formed under many fires. If the high temperature holding stage is not handled well, it will cause coarse crystals.
The Size Range of Stainless Steel Seamless Tube Pipe:
Production | Outside Diameter | Wall Thickness |
Seamless Tube/ Pipe | 6.00mm to 630mm | 1mm to 48mm |
The Chemical Composition of Stainless Steel Seamless Tube Pipe:
Grade | C(max) | Mn (max) | Si(max) | P(max) | S(max) | Cr | Ni | |
304
| 0.08 | 2.0 | 0.75 | 0.045 | 0.030 | 18.0-20.0 | 8.0--11.0 | |
304L
| 0.030 | 2.0 | 0.75 | 0.045 | 0.030 | 18.0-20.0 | 8.0--13.0 | |
304H
| 0.04-0.10 | 2.0 | 0.75 | 0.045 | 0.030 | 18.0-20.0 | 8.0--11.0 | |
The Mechanical Properties of Stainless Steel Seamless Tube Pipe:
Grade | Tensile Strength(MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness |
Rockwell B (HR B) max | ||||
304 | 515 | 205 | 35 | 90 |
304L | 485 | 170 | 35 | 90 |
304H | 515 | 205 | 35 | 90 |
304H also has a requirement for a grain size of ASTM No 7 or coarser. | ||||
Grade specifications for 304 seriese Stainless Steel Seamless Tube Pipe:
Grade | UNS No | Old British | Europen | Swedish SS | Japanese JIS | ||
BS | En | No | Name | ||||
304 | S30400 | 304S31 | 58E | 1.4301 | X5CrNi18-10 | 2332 | SUS 304 |
304L | S30403 | 304S11 | - | 1.4306 | X2CrNi19-11 | 2352 | SUS 304L |
304H | S30409 | 304S51 | - | 1.4948 | X6CrNi18-11 | - | - |
These comparisons are approximate only. The list is intended as a comparison of functionally similar materials not as a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted. | |||||||
| Norminal Pipe Size | Outside Diameter | Wall Thicknesses Schedule ANSI/ASME B36.10M,B36.19M | ||||||||||||||||
| DN(in.) | D | sch5s | sch10s | sch10 | sch20 | sch30 | sch40s | STD | sch40 | sch60 | sch80s | XS | sch80 | sch100 | sch120 | sch140 | sch160 | XXS |
| 1/8 | 10.3 | --- | 1.24 | --- | --- | --- | 1.73 | 1.73 | 1.73 | --- | 2.41 | 2.41 | 2.41 | --- | --- | --- | --- | --- |
| 1/4 | 13.7 | --- | 1.65 | --- | --- | --- | 2.24 | 2.24 | 2.24 | --- | 3.02 | 3.02 | 3.02 | --- | --- | --- | --- | --- |
| 3/8 | 17.1 | --- | 1.65 | --- | --- | --- | 2.31 | 2.31 | 2.31 | --- | 3.2 | 3.2 | 3.2 | --- | --- | --- | --- | --- |
| 1/2 | 21.3 | 1.65 | 2.11 | --- | --- | --- | 2.77 | 2.77 | 2.77 | --- | 3.73 | 3.73 | 3.73 | --- | --- | --- | 4.78 | 7.47 |
| 3/4 | 26.7 | 1.65 | 2.11 | --- | --- | --- | 2.87 | 2.87 | 2.87 | --- | 3.91 | 3.91 | 3.91 | --- | --- | --- | 5.56 | 7.82 |
| 1 | 33.4 | 1.65 | 2.77 | --- | --- | --- | 3.38 | 3.38 | 3.38 | --- | 4.55 | 4.55 | 4.55 | --- | --- | --- | 6.35 | 9.09 |
| 1¼ | 42.2 | 1.65 | 2.77 | --- | --- | --- | 3.56 | 3.56 | 3.56 | --- | 4.85 | 4.85 | 4.85 | --- | --- | --- | 6.35 | 9.7 |
| 1½ | 48.3 | 1.65 | 2.77 | --- | --- | --- | 3.68 | 3.68 | 3.68 | --- | 5.08 | 5.08 | 5.08 | --- | --- | --- | 7.14 | 10.15 |
| 2 | 60.3 | 1.65 | 2.77 | --- | --- | --- | 3.91 | 3.91 | 3.91 | --- | 5.54 | 5.54 | 5.54 | --- | --- | --- | 8.74 | 11.07 |
| 2½ | 73 | 2.11 | 3.05 | --- | --- | --- | 5.16 | 5.16 | 5.16 | --- | 7.01 | 7.01 | 7.01 | --- | --- | --- | 9.53 | 14.02 |
| 3 | 88.9 | 2.11 | 3.05 | --- | --- | --- | 5.49 | 5.49 | 5.49 | --- | 7.62 | 7.62 | 7.62 | --- | --- | --- | 11.13 | 15.24 |
| 3½ | 101.6 | 2.11 | 3.05 | --- | --- | --- | 5.74 | 5.74 | 5.74 | --- | 8.08 | 8.08 | 8.08 | --- | --- | --- | --- | --- |
| 4 | 114.3 | 2.11 | 3.05 | --- | --- | --- | 6.02 | 6.02 | 6.02 | --- | 8.56 | 8.56 | 8.56 | --- | 11.13 | --- | 13.49 | 17.12 |
| 5 | 141.3 | 2.77 | 3.4 | --- | --- | --- | 6.55 | 6.55 | 6.55 | --- | 9.53 | 9.53 | 9.53 | --- | 12.7 | --- | 15.88 | 19.05 |
| 6 | 168.3 | 2.77 | 3.4 | --- | --- | --- | 7.11 | 7.11 | 7.11 | --- | 10.97 | 10.97 | 10.97 | --- | 14.27 | --- | 18.26 | 21.95 |
| 8 | 219.1 | 2.77 | 3.76 | --- | 7.04 | 8.18 | 8.18 | 8.18 | 10.31 | 12.7 | 12.7 | 12.7 | 15.09 | 18.26 | 20.62 | 23.01 | 22.23 | |
| 10 | 273.1 | 3.4 | 4.19 | --- | 6.35 | 7.8 | 9.27 | 9.27 | 9.27 | 12.7 | 12.7 | 12.7 | 15.09 | 18.26 | 25.4 | 28.58 | 25.4 | |
| 12 | 323.9 | 3.96 | 4.57 | --- | 6.35 | 8.38 | 9.53 | 9.53 | 10.31 | 14.27 | 12.7 | 12.7 | 17.48 | 21.44 | 25.4 | 28.58 | 33.32 | 25.4 |
| 14 | 355.6 | 3.96 | 4.78 | 6.35 | 7.92 | 9.53 | --- | 9.53 | 11.13 | 15.09 | --- | 12.7 | 19.05 | 23.83 | 27.79 | 31.75 | 35.71 | |
| 16 | 406.4 | 4.19 | 4.78 | 6.35 | 7.92 | 9.53 | --- | 9.53 | 12.7 | 16.66 | --- | 12.7 | 21.44 | 26.19 | 30.96 | 36.53 | 40.49 | |
| 18 | 457.2 | 4.19 | 4.78 | 6.35 | 7.92 | 11.13 | --- | 9.53 | 14.27 | 19.05 | --- | 12.7 | 23.83 | 29.36 | 34.93 | 39.67 | 45.24 | |
| 20 | 508 | 4.78 | 5.54 | 6.35 | 9.53 | 12.7 | --- | 9.53 | 15.09 | 20.62 | --- | 12.7 | 26.19 | 32.54 | 38.1 | 44.45 | 50.01 | |
| 22 | 558.8 | 4.78 | 5.54 | 6.35 | 9.53 | 12.7 | --- | 9.53 | --- | 22.23 | --- | 12.7 | 28.58 | 34.93 | 41.28 | 47.63 | 53.98 | |
| 24 | 609.6 | 5.54 | 6.35 | 6.35 | 9.53 | 14.27 | --- | 9.53 | 17.48 | 24.61 | --- | 12.7 | 30.96 | 38.89 | 46.02 | 52.37 | 59.54 | |
| 26 | 660.4 | --- | --- | 7.92 | 12.7 | --- | --- | 9.53 | --- | --- | --- | 12.7 | ||||||
| 28 | 711.2 | --- | --- | 7.92 | 12.7 | 15.88 | --- | 9.53 | --- | --- | --- | 12.7 | ||||||
| 30 | 762 | 6.35 | 7.92 | 7.92 | 12.7 | 15.88 | --- | 9.53 | --- | --- | --- | 12.7 | ||||||
| 32 | 812.8 | --- | --- | 7.92 | 12.7 | 15.88 | 17.48 | 9.53 | 17.48 | --- | --- | 12.7 | ||||||
| 34 | 863.6 | --- | --- | 7.92 | 12.7 | 15.88 | 17.48 | 9.53 | 17.48 | --- | --- | 12.7 | ||||||
| 36 | 914.4 | --- | --- | 7.92 | 12.7 | 15.88 | 19.05 | 9.53 | 19.05 | --- | --- | 12.7 | ||||||
| 38 | 965.2 | --- | --- | --- | --- | --- | --- | 9.53 | --- | --- | --- | 12.7 | Note: sch5s,10s,40s,80s Used for steel pipe fittings | |||||
| 40 | 1016 | --- | --- | --- | --- | --- | --- | 9.53 | --- | --- | --- | 12.7 | ||||||
| 42 | 1066.8 | --- | --- | --- | --- | --- | --- | 9.53 | --- | --- | --- | 12.7 | ||||||
| 44 | 1117.6 | --- | --- | --- | --- | --- | --- | 9.53 | --- | --- | --- | 12.7 | ||||||
| 46 | 1168.4 | --- | --- | --- | --- | --- | --- | 9.53 | --- | --- | --- | 12.7 | ||||||
| 48 | 1219.2 | --- | --- | --- | --- | --- | --- | 9.53 | --- | --- | --- | 12.7 | ||||||
| Summary | Standards |
| Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes | ASTM A 213 / A 213M |
| Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service | ASTM A269 / A 269N |
| Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes | ASTM A312/A312M |
| Standard Specification for Seamless Stainless Steel Mechanical Tubing and Hollow Bar | ASTM A511 / A 511M |
| Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service | ASTM A789/A789M |
| Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe | ASTM A790/A790M |
| Standard Specification For Seamless Stainless Steel Tubes,cold and hot finished | GOST9941-81 |
| Standard Specification For Seamless Stainless Steel Tube for Pressure purposes | EN 10216-5 |
| Standard | Outside Diameter Tolerance(mm) | Thickness Tolerance(mm) | Length Tolerance (mm) | |||
| ASTM A269 | D<12.7 | ±0.13 | ±15% | +3.2 / -0 | ||
| (12.7~38.1] | ±0.13 | ±10% | ||||
| [38.1~88.9) | ±0.25 | +4.8 / -0 | ||||
| [88.9~139.7) | ±0.38 | |||||
| [139.7~203.2) | ±0.76 | |||||
| ASTM A213 | D<25.4 | ±0.1 | D≤38.1 | +20%/ -0% | D≤50.80 | +3 / -0 |
| [25.4~38.1] | ±0.15 | |||||
| (38.1~50.8) | ±0.2 | D>38.1 | +22%/ -0% | D>50.8 | +5 / -0 | |
| [50.8~63.5) | ±0.25 | |||||
| [63.5~76.2) | ±0.30 | |||||
| [76.2~101.6] | ±0.38 | |||||
| (101.6~190.5] | +0.38 / -0.64 | |||||
| (190.5~228.6] | +0.38 / -1.14 | |||||
| ASTM A312 | [10.29~48.26] | +0.4 / -0.8 | 10.3~73 | +20% / -12.5% | +6 / -0 | |
| 88.9~457 T/D≤5% | +22.5% / -12.5% | |||||
| (48.26~114.30] | ±0.80 | 88.9~457 T/D>5% | +15% / -12.5% | |||
| (114.30~219.08] | +1.6 / -0.8 | 508above T/D<5% | +22.5% /-12.5% | |||
| (219.08~457.20] | +2.4 / -0.8 | 508above T/D>5% | +15%/-12.5% | |||
| ASTM A789 | D<12.7 | ±0.13 | ±15% | +3 / -0 | ||
| [12.7 to 38.1) | ±0.13 | ±10% | ||||
| [38.1 to 88.9) | ±0.25 | +5 / -0 | ||||
| [88.9 to 139.7) | ±0.38 | |||||
| [139.7 to 203.2) | ±0.76 | |||||
| ГОСТ 9941-81 | [5~10] | Normal:±0.30 High:±0.20 Higher:±0.15 | T:0.2 | Normal:±0.05; High:±0.03 | / | |
| T:0.3~0.4 | Normal:±0.07; High:±0.05 | |||||
| T:0.5~1.0 | Normal:±0.15; High:±0.10 | |||||
| [11~30] | Normal:±0.40 High:±0.30 Higher:±0.20 | T:1.2~3.0 | Normal:+12.5% / -15%; High:±12.5%; Higher:+12.5% / -10% | |||
| T:3.5~7.0 | Normal:±12.5%; High:+12.5% / -10%; Higher:±10% | |||||
| [32~95] | Normal:±1.2% High:±1% Higher:±0.8% | T:7.5~8.5 | Normal:+12.5% / -10%; Higher:±10% | |||
| EN10216-5 | D3 | ±0.75% / ±0.30mm | T3 | ±10%/ ±0.20mm | L≤6m | +5 +0 |
| D4 | ±0.5% / ±0.10mm | T4 | ±7.5% / ±0.15mm | ≥6~12M | +10-0 | |
- All of our stainless steel seamless pipe & tubes are packaged as per international standard to prevent any possible damage or loss. By default, we will use thick woven plastic bag to bundle the finished pipes together in batches.
- For some special pipes & tubes that are vulnerable to dirt, scratches, stress or rough handling, we will suggest wooden case for protection. Kindly note, wooden case can incur extra cost, not only its own cost, but also the increased freight cost, which is especially true for air transportation.
- For enhanced customer experience, we also provide dedicated package as per your special requirements.
We provide Manufacturer TC (Test Certificate) in accordance to EN 10204/3.1B, Raw Materials Certificate, HT/DNT Test Report, Third Party Inspection Report.
• EN 10204/3.1B
• Raw Materials Certificate
• HT/NDT Test Report
• Third Party Inspection Report
Material Testing: We ensure that all our materials go through strict quality tests before dispatching them to our clients.
• Mechanical Testing
• Hardness Test
• Chemical Analysis - Spectro Analysis
• Positive Material Identification - PMI Testing
• Flattening Test
• Flaring Test
• Intergranular Corrosion (IGC) Test
- 1. General service
- 2. Curatorial Industry
- 3. Food Industry
- 4. Ornamental
- 5. Aerospace Industry
- 6. Petrochemical
- 7. Fluid transport
- 8. Nuclear Industry
- 9. Boiler heat- exchanger
- 10. Oil and gas service
Guohao Steel adhere to the high standards of integrity and compliance required, including:
- Environmental standards
- Health and safety standards
- Ethical trading standards
- Export compliance requirements
In order to achieve our goals, we are improving our facilities and expanding our machinery to offer broader processing capabilities. Additionally, our investment extends to the growth and development of our teams, which represent our most valuable resource. We aim for our customers to receive the best experience and trust in the expertise, knowledge, and experience of our teams. As we continue looking towards the future, we rely on our core values to guide both decisions and actions.
- More than 16 Years of Experience in Stainless Steel Production.
- Provides cost-effective products and professional services to you.
- We offer an extensive range of stainless steel, super duplex steel,nickel alloy.
1.Q: Do you provide customized product services?
A: Of course, we can design and produce the products you need based on your specifications and drawings. For example: special dimensions, special controls, OEM, etc.
2.Q: Are you a manufacturer or trader?
A: We are manufacturers. We have our own factory to produce and process various kinds of stainless steel /nickel alloy pipes.
3.Q: Can we get the some samples?Is there a charge?
A: Yes, we will provide you with the samples you want. The samples are free of charge, but the customer may have to pay the freight.
4.Q: Can we visit your factory?
A: Of course, we welcome you to visit our factory on-site or visit our production line through online videos to learn more about our strength and quality. Once we have your schedule, we will arrange a professional sales team to follow up with you.
5.Q: How do you ensure the quality of the product?
A: All products must undergo three inspections throughout the entire manufacturing process, including production, cutting, and packaging. The factory inspection report is provided with the goods. If necessary, third-party inspections such as SGS can be accepted.
6.Q: What is your delivery time?
A: Different products and procurement quantities have different delivery times. The product will be delivered as soon as possible on the basis of quality assurance. Usually, if the goods are in stock, it takes 3-10 days. Alternatively, if the goods are out of stock, it will take 25 to 45 days.
7.Q: Can you arrange shipment?
A: Of course, we have freight forwarders who have been cooperating for many years. We are VIP and can provide you with the most favorable prices and professional services.
8.Q: What if I don't have import experience?
A: We have rich export experience. As long as you have an import license, please leave the rest to us! We will help you choose the most suitable transportation service to safely and accurately deliver the product to the place where it is needed.
