Boiler tubes

 
Boiler tubes are used in heat exchange appliances in which the energy is transferred from one medium to the other.

How to choose good quality boiler tubes?

While choosing boiler tubes, look for the following to pick out the right and good quality tubes:

1. Look at the cross-section of the tube. A good quality seamless tube will have a smooth cross-section and will be devoid of bumps and irregularities.
2. Check the density of the pipe to understand the percentage of impurities in the pipe. If the pipe shows low density, steer clear!
3. Check the surface of the boiler tube. A good quality boiler tube will have a smooth surface. If you find the surface to be rough and uneven, you can be sure that the quality is not up to the mark.

Boiler Tube Standard Specifications

Sunny Steel has an extensive range of boiler and stay tubes available to meet your boiler tube requirements no matter how demanding.

GB

Chinese National standards

• GB 3087: Seamless steel tubes for low and medium pressure boiler
• GB 5310: Seamless steel tube for high pressure boiler
• GB 13296: Seamless steel tubes for boilers and heat exchangers
• GB 6479: Seamless steel tubes for high-pressure chemical fertilizer equipment
• GB 9948: Seamless steel tubes for petroleum cracking

ASME

American society of mechanical engineers

• ASME SA-106: Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service
• ASME SA-192M: Seamless Carbon Steel Boiler Tubes for High Pressure
• ASME SA-209M: Seamless carbon-Molybdenum Alloy-Steel Boiler and Superheater Tubes
• ASME SA-210M: Seamless Medium-carbon Steel Boiler and Superheater Tubes
• ASME SA-213M: Seamless ferritic and austenitic alloy steel boiler, superheater and heat exchanger tubes
• ASME SA178: Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater

ASTM

Chinese National standards

• ASTM A213: Seamless ferritic and austenitic alloy steel boiler, superheater and heat exchanger tubes
• SA213-T2: ASME SA213 T2 has allowable stresses listed up to 1000F in the ASME Boiler Code.
• SA213-T9
• SA213-T12: Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, Heat-Exchanger Tubes.
• SA213-T11: The tubes are used in heat exchangers, super heaters and in boilers.
• SA213-T22: ASM T22 Boiler Tube is a high temperature tolerance tube that is used in acidic and corrosive environments such as the hydrochloric processing and in aluminum chloride catalyst involving applications.
• ASTM A 106M: Seamless Carbon Steel Pipe for High-Temperature Service
• ASTM A192M: Seamless Carbon Steel Boiler Tubes for High Pressure
• ASTM A210M: Seamless Medium-carbon Steel Boiler and Superheater Tubes
• ASTM A 335M: Seamless ferritic alloy-steel pipe for high-temperature service

EN

Deutsche industrie normen

• EN 10216-2 : Seamless steel tubes for pressure purposes

DIN

Deutsche industrie normen

• DIN 17175:Seamless Tubes of Heat-resistant Steels - Technical Conditions of Delivery

JIS

Japanese industrial standards

• JIS G3461: Carbon steel boiler and heat exchanger tubes
• JIS G3462: Alloy steel boiler and heat exchanger tubes
• JIS G3463: Stainless Steel for Boiler and Heat Exchanger Tubes

STAINLESS STEELS

– Austenitic stainless steels

SA213-T304:

– The SA 213 Tp 304 Material consists of 18% chromium and carbon, manganese, phosphorus, sulfur, silicon and nickel in the composition.

SA213 TP304 is a range of minimum wall thickness pipe series. We supply the SA 213 TP 304 Pipes in different types, shapes and sizes. The SA 213 Tp 304 Material consists of 18% chromium and carbon, manganese, phosphorus, sulfur, silicon and nickel in the composition. There is also the molybdenum, nitrogen, niobium and titanium addition in trace quantities. The SA 213 Tp 304 Density is lower than the ordinary 304 material. It is 7.8 grams per cubic centimeter. We offer ASTM A213 TP 304 for high temperature services. Our 304 Stainless Steel Tube components are of less absolute roughness which means they could be used in high precision equipment and applications.

Austenitic stainless steels are presented in the ASME Boiler and Pressure Vessel Code with two sets of allowable stresses. The reason for this is their relatively low yield strength. The higher allowable stress values were determined at temperatures where the usage would be restricted by the short-time tensile properties.

The higher stresses exceed 62-1/2%, but do not exceed 90% of the yield strength. At these stresses, small amounts of plastic deformation can be expected. These higher stress values are usually used for super-heater and reheater tubing.

The Boiler Code lists maximum allowable stresses for varying temperatures depending on the individual austenitic stainless grade.

Variations of this 18 chromium, 8 nickel grade include 304L, 304LN, 304H and 304N. Each of these offers excellent corrosion and oxidation resistance along with high strength.
High strengths are maintained in the low carbon grades by controlling the nitrogen content.

T304 has higher carbon and a minimum solution annealing temperature to assure good long-time elevated temperature strengths. T304 grades are limited to 1650F under oxidizing conditions. Section I of the ASME Boiler Code lists allowable stresses up to 1500F.

SA213-T316:

– SA213 TP316 Tube is a material standard for heat exchanger tubes that are made from 316 austenitic stainless steel.

The chromium nickel alloy also has molybdenum in its composition which makes it more corrosion resistant and heat resistant than the 304 material. ASME SA213 TP316 is the second most used pipe material in the world next to the 304 material. ASTM A213 TP316 Tube is an austenitic stainless steel but the 213 standard covers both the austenitic and ferritic steels.

Sunny Steel is a supplier of ASTM A213 Grade TP316 products in different standards and sizes. Our 316 Stainless Steel Tube can come with different finishing such as the 316 Stainless Steel Tubing Polished or electropolished. We also provide the pipes in different shapes such the round, rectangular or Stainless Steel 316 Square Tube. The square and 316 Stainless Steel Rectangular Tube is usually used in high pressure applications to withstand the pressure stress at change of directions. The Stainless Steel 316 Seamless Tube is more accurate in dimensions and therefore it is used in high precision applications. Our 316 Stainless Steel Exhaust Tubing is of high quality and can withstand high temperatures; it is used in exhausts, heat exchangers and super heaters. The 316 Stainless Steel Heavy Wall Tubing is used in high pressure applications such as hydraulic systems. Our SS 316 Welded Tube is easy to weld upon. We supply 316 Stainless Steel Welded Tube for affordable prices in different sizes and schedules. Please contact us for further details and pricing.

SA213-TP321 & 347:

– SA213 TP321 is a specification of heat exchanger tubes that are made from the 321 austenitic stainless steel.

SA213 TP321 is a specification of heat exchanger tubes that are made from the 321 austenitic stainless steel. The SA 213 specifies pipe products for heat exchangers in different material grades, both the ferritic and austenitic steels.

Sunny Steel is a supplier of all kinds of stainless steel pipes. The SA213 Tp321 Material is special in that the composition includes titanium which reduces the density of the ASME SA213 Tp321 and therefore making it lightweight.

T321 and 347 are variations of T304 and have comparable minimum tensile properties. These two grades are stabilized with additions of titanium and columbian respectively, along with proper heat treatment.

To insure good long-time strength at elevated temperatures, T321H and 347H-like 304H-were developed with higher carbon contents and specified minimum solution annealing temperatures.

Of all the stainless steels, T309 (25 chromium, 13 nickel) and T310 (25 chromium, 20 nickel) offer the maximum resistance to oxidation and corrosion. They also offer good high-temperature properties. Since these steels contain ferrite, however, they are more susceptible to sigma phase.