Carbon Steel Boiler Pipe

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Carbon Steel Boiler Pipe

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Boiler Pipe

Pipa Seamless Boiler

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Boiler pipe is a pipe that has special specifications and is used as a boiler manufacturing installation where, this pipe has heat and pressure resistance characteristics at hot temperatures, many specifications on boiler pipes depending on needs. Boiler pipe dimensions vary in terms of pipe wall thickness and pipe length in general 7 meters.

Carbon Steel Boiler Pipe exhibits mild corrosion resistance and fair strength up to 1000F. However, their use above 800F must take into account the susceptibility to graphitization. Graphitization is not yet a significant problem in thickness encountered in tube boilers. The use of pipe sections weighing above 800F, however, is not recommended. The application of seamless and welded carbon steel pipes in boilers is limited to a maximum temperature of 800F for framed and 1000F for steel slurry with ASME Boiler and Vessel Codes, ”Part I, Power Plant Boilers. The code does not list a maximum allowable pressure beyond 1000F for carbon steels.Carbon-molybdenum steels

STEELS CARBON – MOLYBDENUM

SA209

Carbon – moly steels exhibit higher creep strength than ordinary carbon steels, and are widely used in high temperature boiler service. These steels are nominally containing 0.5% molybdenum. When exposed to temperatures above 850 – 900F for a long period of time, carbon – moly steels are also susceptible to graphitization. Again, this phenomenon is part size dependent, and using pipes of this class above 850F is not recommended. The carbide stage is unstable, and it will return to graphite. ASME Steel moly boilers up to 1000F.

ALLOY CHROME INTERMEDIATE

SA213 – T2

These low alloy steels exhibit graphitization resistance and greater creep strength than carbon – moly steels. Corrosion resistance is comparable to carbon – moly. T2 has a listed allowable pressure of up to 1000F in ASME Code Boilers. The chromium in all Croloys stabilizes carbon as chromium carbide, thus making them immune to graphitization.

SA213 – T12

This is a 1 – chromium, 1/2-molybdenum alloy which is limited to a maximum temperature of 1200F by the ASME Boiler and Vessel Code, “Part I, Emphasis is permitted. “T12 is sometimes used instead of T2 tubes because of its greater strength.

SA213 – T11

This class has the same creep strength properties as T12. It is more resistant to corrosion-free chromium steel, and fairly resistant to high temperature oxidation due to its higher silicon and chromium contents.

This oxidation resistance is important because metal is exposed to high temperatures for a long time to build up a layer of scale protection. At some minimum temperature, the scale will become non-adherent, gradually flake off, and cause erosion of turbine solid particles. However, exfoliation rarely causes failure before creeping or high temperatures produce

The allowable voltage is listed by the ASME Boiler and the Vessel Code for 1200F.

SA213 – T22

This 2-1 / 4 chromium, 1 molybdenum alloy has very high creep properties, but is limited for applications to 1125F because of the possibility of a higher exfoliation temperature scale. It is listed in the ASME Boiler Code for temperatures of 1200F.

SA213 – T9

A 9 – chromium – molybdenum alloy 1, T9 offers excellent corrosion resistance with good high temperature strength. It also has good oxidation resistance and can be used for maximum 1200F. At times the T9 is an adequate substitute for the more expensive stainless grades. The Boiler Code limits the T9 to 1200F.

Boiler pipes are made of heat-resistant carbon and low-alloy steel which can withstand loads at high pressure and temperature. Boiler tubes are used for parts of energy type equipment such as boilers, steam superheaters, steam pipes, etc. The tubes are provided as hot rolled or cold drawn. Steel specifications, dimensions and types are shown in separate figures.

Boiler pipe dimensions and tolerances

The pipe dimensions range from 10.2 mm to 139.7 mm, from 21.3 mm in diameter and a wall thickness from 2.3 mm and they are given as hot rolled. The smaller diameter tubes and the larger diameter thick wall tubes are given as cold drawn and then they are heat treated. The delivery tube in this condition occurs only if there is an advance agreement at the time of ordering the tube. Under the agreement it is possible to provide boiler tubes with dimensions and tolerances in accordance with dimensional specifications for tube precision. The tube dimensions meet the following requirements:

EN 10216-2: P195GH, P235GH, P265GH, 16Mo3, 14MoV6-2, 14MoV6-3, 10CrMo5-5, 13CrMo4-5, 10CrMo9-10, 11CrMo9-10, 25CrMo4, T2, T24, T5, T91; ASTM A 106: Class A, Class B, Class C. Additional steel according to DIN 17175, BS 3059-1, BS 3059-2, BS 3602-1, BS 3604-1, NFA 49-211, NF A 49 – 213, UNI 5462, GOST 8731, GOST 4543, GOST 20.072 and PN – H 74252 and their chemical composition and mechanical properties are shown in separate figures

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