Q245R boiler and pressure vessel steel plate

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Q245R boiler and pressure vessel steel plates I. Introduction to Q245R, Q245R (HIC), and Q245R (R-HIC). Q245R boiler and pressure vessel steel plates belong to a category of steel plates known as boiler plates; examples include Q245R. Q—the first letter of the Pinyin for “qu”. 245—Yield strength value. R: The first letter of the Pinyin for “rong” in Chinese. Q245R has special compositions and properties; it is primarily used for manufacturing pressure vessels. Depending on the application, temperature requirements, and corrosion resistance needs, different material grades for vessel plates should be selected. II. Delivery conditions for Q245R, Q245R (HIC), and Q245R (R-HIC): The common heat treatment processes for Q245R are hot rolling, controlled rolling, and normalizing. Inspection is carried out at three stages. The impact temperature is -20°C; if there are special requirements, Z-directional property tests such as Z15, Z25, and Z35 must also be conducted. For Q245R(HIC) and Q245R(R-HIC), it is also necessary to control the P and S contents as well as the X factor. III. Comparison of old and new grades for Q245R: 20R\20G followed the previous technical standards, namely GB6654 and GB713-86; Q245R is the newer grade, with the standard being GB713-2014. The two are actually made of the same material; it’s just that their names are different. IV. Chemical composition of Q245R, Q245R (HIC), and Q245R (R-HIC): C: ≤0.20; Si: ≤0.35; Mn: 0.50–1.00; P: ≤0.025; S: ≤0.015; Alt: ≥0.020. Note: 1. If trace elements such as Nb, Ti, and V are added to Q245R, the lower limit for Alt does not apply. 2. For steel plates with a thickness greater than 60 mm, the upper limit for Mn content can reach 1.20%. V. Mechanical and process properties of Q245R, Q245R (HIC), and Q245R (R-HIC):
For thicknesses of 6–16 mm:
Tensile strength Rm/Mpa (N/mm2): 400–520
Yield strength ReL/Mp (N/mm2): 245
Elongation A/%: 25
Impact test temperature/°C: 0
Impact energy KV2/J: 311
80° bending test – Bending diameter: d=1.5a

For thicknesses of 17–36 mm:
Tensile strength Rm/Mpa (N/mm2): 400–520
Yield strength ReL/Mp (N/mm2): 235
Elongation A/%: 25
Impact test temperature/°C: 0
Impact energy KV2/J: 311
80° bending test – Bending diameter: d=1.5a

For thicknesses of 37–60 mm:
Tensile strength Rm/Mpa (N/mm2): 400–520
Yield strength ReL/Mp (N/mm2): 225
Elongation A/%: 25
Impact test temperature/°C: 0
Impact energy KV2/J: 311
80° bending test – Bending diameter: d=1.5a

For thicknesses of 61–100 mm:
Tensile strength Rm/Mpa (N/mm2): 390–510
Yield strength ReL/Mp (N/mm2): 205
Elongation A/%: 24
Impact test temperature/°C: 0
Impact energy KV2/J: 311
80° bending test – Bending diameter: d=2a

For thicknesses of 101–150 mm:
Tensile strength Rm/Mpa (N/mm2): 380–500
Yield strength ReL/Mp (N/mm2): 185
Elongation A/%: 24
Impact test temperature/°C: 0
Impact energy KV2/J: 311
80° bending test – Bending diameter: d=2a

VI. Application prospects of Q245R, Q245R (HIC), and Q245R (R-HIC):
Q245R is primarily used in the petroleum and petrochemical industries, as well as in companies that manufacture chemical equipment, boilers, and pressure vessels. It is used to fabricate reactors, heat exchangers, separators, spherical tanks, oil and gas tanks, liquefied gas tanks, pressure vessels for nuclear reactors, liquefied petroleum gas cylinders, and turbine casings. Its applications are widespread in areas such as petroleum chemistry, coal conversion, nuclear power, and turbine manufacturing. In large-scale equipment with complex corrosive environments, such as wash towers, second shift converters, coke towers, desulfurization tanks, conversion gas waste heat boilers, methanation reactors, reactors, regenerators, hydrogenation reactors, methanation heaters, conversion gas steam generators, and other such devices and components, Q245R (HIC) and Q245R (R-HIC) steel plates are widely used in their construction and manufacturing.