Types and grades of JlS G 3467-1988 steel pipes for heating furnaces

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Steel tubes for heating furnaces are divided into two categories according to the mechanical properties of different steel grades:

(1) high-strength steel tubes;

(2) high-temperature steel tubes.

High-strength steel tubes are steel tubes made of steel grades with high-strength, such as Q235A, 20#, 35# and 40#. The tensile strength of steel tubes made of high-strength steel grades is greater than or equal to 480MPa. Its chemical components are C <= 0.17%, Si <= 0.35%, Mn <= 0.65%, Cr <= 0.15%, P <= 0.045%, S <= 0.045%, Ni <= 0.03%.

High-temperature steel tubes are steel tubes made of steel grades with high temperature resistance, such as 10CrMo910, 15CrMoG, 12Cr1MoVG, 2Cr5Mo and 35CrMoM. The tensile strength of the steel tubes made of these high temperature-resistant steel grades is greater than or equal to 585MPa. The chemical components of the steel tubes are generally C 0.080%-0.16%, Si 0.17%-0.37%, Mn 0.41%-0.70%, Cr ≤ 0.25%, P ≤ 0.035%, S ≤ 0.035% and Ni ≤ 0.30%.

The nameplate of steel tubes for heating furnaces indicates the chemical components and mechanical properties of the tubes. Generally, the nameplate includes the following information:

(1) Steel grade;

(2) Chemical components;

(3) Tolerance;

(4) Tensile strength;

(5) Length;

(6) Wall thickness;

(7) Manufacturer;

(8) Certification authority;

(9) Inspection date.

Steel tubes for heating furnaces shall be manufactured according to the corresponding technical standards, such as GB/T711-2008, GB/T9711.2-2011, GB/T8123.1-2008, GB/T3094-2012 and JB/T6728-2002. Steel tubes for heating furnaces shall be inspected by quality inspection departments and given a quality certificate before leaving the factory.

Classification and grades of steel pipes for heating furnace

Steel pipes for heating furnace are widely used and play an important role in the heating application of petroleum, chemical industry, boiler, power station and other industrial fields. In order to meet the needs of different fields, various kinds of steel pipes are produced and supplied by steel pipe manufacturers.

Generally speaking, the steel pipes for heating furnace can be classified as seamless steel pipe, welded steel pipe and U tubes according to the manufacturing method, and the most commonly used grade is 10, 20 and other carbon steel pipes. 10# steel pipes and 20# steel pipes are the most commonly used grades. Generally, 10# steel and 20# steel seamless steel pipes are produced and supplied in large quantities. The performance of 10# steel and 20# steel pipes for heating furnace is relatively good, and their cost performance is very high.

In addition to ordinary 10# steel and 20# steel seamless steel pipes, there are also some steel pipes for heating furnace with special properties, such as high temperature resistant steel pipes and alloy steel pipes, which are mainly applied in petroleum, chemical industry, boiler, power station and other special industrial fields. Besides, heat-resistant steel pipes are usually used to make springs, tools, bearings and other parts, and the alloy steel pipes is used to make flanges and other accessories.

In a word, various kinds of steel pipes for heating furnace can meet the needs of different fields, grade 10, 20 and other carbon steel pipes are of good performance and high cost performance. In addition, steel pipes with special properties should be used to meet the needs of special cases.