Can Q235B still be used to make pressure vessels?

It can be used, in accordance with Appendix D "Q235 series steel plate use regulations", as long as its conditions are met, which has a good impact on chemical composition and mechanical properties.

In fact, the "Solid Capacity Regulations" does not limit Q235 steel plates, but only stipulates carbon steel.

and the requirements of the chemical composition and mechanical properties of low-alloy steel, which can be used in accordance with its regulations. Our factory has been using it, and some of the experts we consulted said the same.

It can not be used, with reference to the new capacity specification and the new 150 and the new material standard, the Q235B standard has been removed.

Yes, according to the requirements of GB150-2011, the thickness of 6mm steel plate should be done impact test, the test results should meet the provisions of GB T700, the steel plate should also meet the following requirements: the steel plate should be cold-formed test, and the design pressure of the container, the use temperature is 20 300, the P content of the steel plate, S content.

It is not clear whether there is a specific one, but most pressure vessel manufacturers no longer use Q235B, and now they use Q345R

The material is tougher and the safety factor is higher. If there is a special need to use Q235B pressure vessels, the manufacturer also produces and manufactures according to the customer's requirements, but the pressure vessel manufacturers of these two materials are the same. Hope it helps.

The cancellation of Q235-B, there is no Q235-B in GB 713-2008, so the material selection of pressure vessels can not use Q235-B, while atmospheric vessels can be continued to be used after guessing.

The difference between 16mnr, 16mn, and q345r:

1. Different uses.

Q345R steel is yield strength.

It is a special plate for pressure vessels of 345MPa grade, and it has good comprehensive mechanical properties.

and process performance. 16mnr is an ordinary low-alloy steel, which is a special steel for boilers and pressure vessels, and a common material for boilers and pressure vessels. 16mn steel belongs to carbon-manganese steel.

The carbon content is around the limit, and the yield point is equal to 343MPa (the strength level is 343MPa). 1

6MN steel has less alloy content and good weldability, so it generally does not need to be preheated before welding. But since 16mn steel has a higher tendency to harden than mild steel.

It is slightly larger, so it is necessary to take preheating measures to prevent cold cracks when welding at low temperatures (such as winter open-air operations) or on large rigidity and thick structures.

2. The carbon content is different.

Q345R steel plate.

Niobium, vanadium and titanium can be added, and their content should be filled in the quality certificate, and the sum of the above three elements should not be greater than12%。

16Mn is: 16Mn is called low-alloy high-strength structural steel: the carbon content is, and the main alloying elements manganese (Mn), silicon (Si), vanadium (V), niobium (Nb) and titanium (Ti) are added.

16mnr is an ordinary low-alloy steel, which is a special steel for boilers and pressure vessels, and a common material for boilers and pressure vessels.

3. The performance is different.

Q345R is an ordinary low-alloy steel, which is a commonly used steel for boilers and pressure vessels, and the delivery condition is divided into: hot-rolled or normalized.

It is a low-alloy steel. The performance is similar to that of Q345 (16Mn) (the yield strength of 16mm steel plate is greater than 345MPa), and the tensile strength.

is between (510-640), elongation.

>21%, zero-degree V-type impact energy >34J.

The hardening tendency of 16mn steel is slightly greater than that of mild steel, so preheating measures are required to prevent cold cracks when welding at low temperatures (such as winter open-air operations) or on large rigidity and thick structures.

16mnr steel is a special plate for pressure vessels with a yield strength of 340MPa, which has good comprehensive mechanical properties and process properties. The phosphorus and sulfur content is slightly lower than that of ordinary 16mn steel, except for tensile strength and elongation.

In addition to being higher than ordinary 16mn steel, it is also required to ensure impact toughness.

Answer]: Q235-A·F is a low-carbon boiling steel, which does not belong to the calm and trembling steel, and cannot be used for simple press-fit key force containers. Q235-A is a calm steel, can be used for simple pressure vessels, but should meet the requirements of the phase cavity chain product standards.

It can be used in the following cases.

First, it should not be used in extremely hazardous and highly hazardous media.

Second, the thickness of the Q235B material used for the pressure vessel shell shall not be greater than 16mmFor other pressurized elements, it should not be larger than 30mm

Third. The container pressure is less than.

Fourthly, the chemical composition of Q235B steel is in line with GB T700-2006The quality certificate s is less than or equal to less than or equal to.

Fifth. Steel plates with a thickness greater than or equal to 6mm shall be subject to impact test and comply with the provisions of GB T700.

Sixth. The steel plate is cold-formed and complies with the provisions of GB T700.

Seventh. Q235B uses 20-300 degrees.

See Appendix D. for details

It cannot be used in the manufacture of pressure vessels. I understand:

The series belongs to the low-alloy steel plate for structure, which only pays attention to mechanical properties, does not emphasize chemical composition, and the control of impurities and chemical composition is not strict, so it is not suitable for use in pressure equipment.

Although the series is also carbon structural steel, its plasticity is good, low-cost, appropriate control of impurity content and increase impact and other testing items, used in low pressure and general medium pressure vessels are very economical.

3.In contrast, Q345B C steel plate does not have the above advantages, and Q345R is not much different from the first, if the increase in testing items and adopt, not only is it not necessary, but also not economical, but also easy to cause potential safety hazards.

No, but Q235B can, I wonder if there are regulations in GB150-2011.

No, Q345 series steel plate cannot be used for the main pressure element of the pressure vessel.

a)q235

A The scope of application of steel plates:

1.The design pressure of the vessel is less than or equal to.

2.The operating temperature of the steel plate is 0-350

Celsius. When used for housing, the thickness of the steel plate is not more than 16mm.

3.It shall not be used for liquefied petroleum gas media and pressure vessels with a high degree of toxicity or extremely hazardous media.

b) Scope of application of Q235-B steel plate:

1.The design pressure of the vessel is less than or equal to.

2.The use temperature of the steel plate is 0-350 degrees Celsius.

When used for housing, the thickness of the steel plate is not more than 20mm.

3.It should not be used in pressure vessels with a degree of toxicity to highly or extremely hazardous media.

The Q235-A steel grade was cancelled on 1 July 2002.

Q235-B in accordance with the provisions of GB150-1998.

The material standard for Q235B is: GB T 700-2006 carbon structural steel.

See screenshot below