304 Stainless Snap Rings provide secure fastening solutions for industrial and mechanical applications with high corrosion resistance and durability.
Stainless 1Cr25Ni20Si2 tube shields are made of 1Cr25Ni20Si2 stainless steel and can be customized to fit perfectly straight sections, curved sections and even finned and Specialty tubes.
304 stainless snap rings are used in conjunction with boiler tube erosion shields, which is a clip that easily installs boiler tube erosion shields to the tube.
304 Stainless is a low carbon (0.08% max) version of basic 18-8 also known as 302. Type 302 has 18% chromium and 8% nickel.
ASTM A213 TP304 Stainless Steel Seamless Tube is manufactured by seamless process used in high pressure environment, stainless steel TP304 grade is the most used material due to its high strength and excellent corrosion resistance.
There are hundreds of different grades of stainless steel on the market. Each of these unique formulations of stainless steel offer some degree of corrosion resistance above and beyond that of plain steel.
The existence of these stainless steel variants can cause some confusion—especially when the names & formulations of two stainless steel alloys are almost the same. This is the case with grade 304 and 304L stainless steel.
| Element | Percentage by Weight Maximum Unless Range is Specified | ||
|---|---|---|---|
| 304 | 304L | 304H | |
| Carbon | 0.08 | 0.030 | 0.04-0.10 |
| Manganese | 2.00 | 2.00 | 2.00 |
| Phosphorus | 0.045 | 0.045 | 0.045 |
| Sulfur | 0.030 | 0.030 | 0.030 |
| Silicon | 0.75 | 0.75 | 0.75 |
| Chromium | 18.00 20.00 |
18.00 20.00 |
18.00 20.00 |
| Nickel | 8.0 10.50 |
8.0 12.00 |
8.0 10.5 |
| Nitrogen | 0.10 | 0.10 | 0.10 |
These three alloys are remarkably similar—but there is one key difference. In grade 304 stainless, the maximum carbon content is set at 0.08%, whereas grade 304L stainless steel has a maximum carbon content of 0.03%. The “L” in 304L can be interpreted as meaning extra-low carbon.
This difference of 0.05% carbon content produces a slight, but marked, difference in the performances of the two alloys.
| Grade | Tensile Strength Rm N/mm² |
Yield Strength Rp 0.2, N/mm² | Elongation (%) |
|---|---|---|---|
| 304 Annealed | 500-700 | 195 | 40 |
| 304L Annealed | 460-680 | 180 | 40 |
| Data | Metric | English |
|---|---|---|
| Density | 8 g/cc | 0.289 lb/in³ |
| Hardness, Brinell | 123 | 123 | Converted from Rockwell B hardness. |
|---|---|---|---|
| Hardness, Knoop | 138 | 138 | Converted from Rockwell B hardness. |
| Hardness, Rockwell B | 70 | 70 | |
| Hardness, Vickers | 129 | 129 | Converted from Rockwell B hardness. |
| Tensile Strength, Ultimate | 505 MPa | 73200 psi | |
| Tensile Strength, Yield | 215 MPa | 31200 psi | at 0.2% offset |
| Elongation at Break | 70 % | 70 % | in 50 mm |
| Modulus of Elasticity | 193 - 200 GPa | 28000 - 29000 ksi | |
| Poissons Ratio | 0.29 | 0.29 | |
| Charpy Impact | 325 J | 240 ft-lb | |
| Shear Modulus | 86 GPa | 12500 ksi |
| Electrical Resistivity | 7.2e-005 ohm-cm | 7.2e-005 ohm-cm | at 20°C (68°F); 1.16E-04 at 650°C (1200°F) |
| Magnetic Permeability | 1.008 | 1.008 | at RT |
Grade 304L has a slight, but noticeable, reduction in key mechanical performance characteristics compared to the “standard” grade 304 stainless steel alloy.
Typical specifications for 304 Plate and 304L Stainless Steel Plate are ASTM A-240, ASME SA -240 and A666.
304 stainless steel,also known as 18/8 stainless steel, European norm 1.4301, is the most common stainless steel. The steel contains both chromium (usually 18%) and nickel (usually 8%) metals as the main non-iron constituents. It is an austenite steel. It is not very electrically or thermally conductive, and is non-magnetic. It has a higher corrosion resistance than regular steel and is widely used because of the ease in which it is formed into various shapes.
Grade 304L is the low carbon version of 304. It does not require post-weld annealing and so is extensively used in heavy gauge components.
Design Features - Stainless Steel 304/304L
Typical Applications - Stainless Steel 304/304L
Tensile Requirements - Stainless Steel 304/304L
304 Stainless Steel Plate has very good formability and can be readily welded by all common methods.
Our precision machinery and state of the art facilities enables us to produce these 304 tube shield in superior quality and precise dimensions. All these years have enhanced our capabilities and enabled us to produce all kinds of standard tube shield as well as custom snap rings as per customer’s specifications. We have numerous combinations of sizes readily available in large number of stocks and can fabricate custom sizes according to customer’s requirement.
In common with other austenitic stainless steels, 304 grade has strong work hardening characteristics. Clearly, in some cases, this can be an advantage, but generally, it is an issue to be considered carefully.
If it is likely to be an issue, discussion with the producer can be valuable as minor variations to the precise composition and process can have benefits.
Where heavy sections have to we welded, post-weld annealing may be necessary to restore corrosion resistance.
The cross-sectional shape of boiler tube erosion shields is mostly semi-circular (180 degrees), and there are also 120-160 degrees. It is mainly used on finned tubes (water-cooled walls); boiler tubes erosion shields are divided into direct wear-resistant shields, in-curve anti-wear shields, outer-curve anti-wear shields, side-curve anti-wear shields, s-curve anti-wear shields, etc. The length of the straight anti-wear shields ranges from 20mm to 3000mm, and the general length of 1000-2000mm is commonly used. The anti-wear shields with bends generally requires a processing, drawing and the following parameters should be on the drawing: outer diameter of the pipe used, bending of the pipe radius r (to the centre of the pipe), the degree of bending angle, and the length of the straight sections on both sides of the arc segment of the wear-resistant shields.
The most basic parameter of boiler tube erosion shields is the outer diameter of the tube used (that is, the inner diameter of boiler tubes erosion shields). The main specifications of the tube are: 32, 38, 42, 44.5, 48, 51, 57, 60, 63.5 , 76, 89mm, etc .; the inner diameter of the boiler tubes erosion shields is usually 1-3mm larger than the outer diameter of the tube used, depending on the actual requirements.
Alloy 304 a T-300 series stainless steel austenitic, which has a minimum of 18% chromium and 8% nickel. Type 304 has a maximum carbon of 0.07% . It is the standard “18/8 stainless” that is commonly found in pans and cooking tools. Alloy 304 is the most versatile and widely used alloy in the stainless steel family. Ideal for a wide variety of home and commercial applications, Alloy 304 exhibits excellent corrosion resistance and has a high ease of fabrication, outstanding formability. The austenitic stainless steels are also considered to be the most weldable of the high-alloy steels and can be welded by all fusion and resistance welding processes.
Specifications: UNS S30400
The 304 Stainless Snap Rings are commonly used in:
Snap rings are used in conjunction with boiler tubes erosion shields, which is a clip that easily installs boiler tubes erosion shields to the tube.
The snap ring and Boiler Tubes Erosion Shields are overlapped and welded, generally about 190-200 degrees Erosion Shields is a 180-degree semicircle), but also leave a welding position for easy welding and fixing. Generally, each piece of Boiler Tubes Erosion Shields needs to be equipped with 2-4 snap rings with a pitch of 200-500mm.
The anti-wear snap ring is also called clamp, buckle, tube clamp, etc.
The main role of the anti-wear tile snap ring: the role of fixing the anti-wear tile to avoid problems such as the anti-wear tile falling off during installation.
The types of common anti-wear tile rings can be divided into: U-shaped lap type snap ring, butt-type semicircular snap ring.
The inner diameter of the U-shaped snap ring is the outer diameter of the wear-resistant tile plus the thickness of the wear-resistant tile, and the length varies from 20mm to 70mm. It will be 5mm more in semicircle. The extra part during installation will hold the wear-resistant tile and then spot weld. Compared with the butt-type semicircular snap ring, it is stronger after holding the wear-resistant tile and welding.
C-shaped snap ring is the most common snap ring. Mainly based on the size of anti-friction tile, the diameter and thickness are similar to the matching anti-friction tile, and the length varies from 20mm to 70mm. It is mainly connected to the wear-resistant tile by spot welding when installing the wear-resistant tile, so as to fix and prevent the wear-resistant tile from falling off.
Custom snap rings are the recommended method for tube shield attachment.
All products are purchased to proprietary customized specifications as well as normal industry standards with supporting documentation.
Different types of stainless steel are selected according to the specific conditions of different working conditions.
Common materials are: TP321 (Cr18Ni9Ti), TP309S (Cr23Ni13), 1Cr20Ni14Si2, TP310S (Cr25Ni20), 1Cr25Ni20Si2, and some low temperature areas (such as low temperature superheater, low temperature reheater) are made of 1Cr13, 1Cr6Si2Mo and other materials.
The boiler was originally designed to be accurate. Different materials have different temperature resistance and mechanical strength. 1Cr13, 1Cr6Si2Mo generally has a temperature resistance of 600 ℃ or less.
| Material（Grade） | Temperature resistance | Yield strength | Tensile strength | Elongation | HB | HRB | HV |
|---|---|---|---|---|---|---|---|
| 1Cr18Ni9Ti | 925 ℃ | ≥205MPa | ≥520MPa | ≥40% | ≤187 | ≤90 | ≤200 |
| Cr23Ni13 | 1095 ℃ | ≥205MPa | ≥520MPa | ≥40% | ≤187 | ≤90 | ≤200 |
| 1Cr20Ni14Si2 | 1095 ℃ | --- | ≥590MPa | ≥40% | --- | --- | --- |
| Cr25Ni20 | 1150 ℃ | ≥205MPa | ≥520MPa | ≥40% | ≤187 | ≤90 | ≤200 |
| 1Cr25Ni20Si2 | 1150 ℃ | --- | ≥540MPa | ≥35% | --- | --- | --- |
We can also supply boiler tubes erosion shields of other materials.
Generally, boiler tubes erosion shields are also installed to prevent further wear of the tubes and cause serious consequences such as boiler explosion.
The main role is to protect the heating surface of the boiler pipes, reduce pipeline wear, and increase the heating surface of the pipes.
The snap ring is a short section that is installed on the pipe in conjunction with the wear-resistant tile. Generally, it is welded to the wear-resistant tile by lap welding, that is, to cover the wear-resistant tile slightly, so it is larger than the wear-resistant tile. The opening arc is around 190-200 degrees, the welding position needs to be set aside to facilitate welding and fixing. The width of the snap ring must not be less than 20mm.
The installation requirements of anti-friction tiles of different shapes are slightly different. Basically, each anti-friction tile is installed with not less than 2-4 snap rings. The snap ring and the anti-friction tile are welded together to prevent expansion due to heat. The tiles fall off, and the joints are required to be fully welded.
Generally, boiler tubes erosion shields are also installed to prevent further wear of the tubes and cause serious consequences such as boiler explosion.
The main role is to protect the heating surface of the boiler pipes, reduce pipeline wear, and increase the heating surface of the pipes.
Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.
Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.
Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.
The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.
Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.
The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.
