Gas valve, cylinder cleaning steps general valve carbon steel forging technical conditions
The cleaning of gas valve and steel cylinder valve is one thing that must be done before the assembly of parts and components of the valve. This process can be completed through several strict steps. If there is negligence in these steps, it is very likely to cause hidden dangers in the future use.
The cleaning of gas valve and steel cylinder valve is one thing that must be done before the assembly of parts and components of the valve. This process can be completed through several strict steps. If there is negligence in these steps, it is very likely to cause hidden dangers in the future use.
Cleaning procedures for gas valves and cylinders
Specific steps:
1. According to the processing requirements, some parts need to be polished without processing burrs on the surface
All parts are degreased
3. Pickling passivation is carried out after degreasing, and the cleaning agent does not contain phosphorus
4 After pickling passivation, rinse with pure water, no drug residue, carbon steel parts omit this step
5 Dry the parts one by one with non-woven cloth. Do not leave the surface of the parts with wire wool or blow dry with clean nitrogen
6 Wipe the parts one by one with non-woven cloth or precision filter paper stained with analytical pure alcohol until there is no dirty color.
Read the above steps, I believe you have understood, a quality, safety standards of the bottle valve, in every link to do meticulous, because only in this way is the user safety and customer enterprise responsible!
Technical Conditions for carbon steel forgings of general valves, flanges, pipe fittings and other compression carbon steel forgings requirements, test methods, inspection rules, ordering requirements, marks and quality certificates. The ingot shall have sufficient cutting ends to prevent harmful defects (including shrinkage, segregation, folding, etc.). Forging shall ensure the full deformation of the forgings to meet the design and technical requirements. During forging, the forgings should be ensured to cool slowly as they pass through the phase change temperature range. After the forging is finally formed, it must be cooled to below 500℃ before the specified heat treatment can be carried out.
The scope of
This standard specifies the requirements, test methods, inspection rules, ordering requirements, marks and quality certificates for general compression carbon steel forgings such as valves, flanges and pipe fittings.
This standard applies to general compression carbon steel forgings such as valves, flanges and pipe fittings (hereinafter referred to as forgings). Non – compression forgings can be performed by reference.
Normative reference document
The following documents constitute the terms of this standard by reference to the wood Standard. All subsequent amendments (excluding errata) or amendments to the documents cited at the time of the annotation are not applicable to this standard. However, parties to an agreement under the wood Standard are encouraged to investigate the use of these versions of the documents. For undated references, their versions are applicable to this standard.
GB 150 steel pressure vessel
GB/T 228 Metallic materials — Tensile test method at room temperature (GB/T 228-2000,eqv ISO 6892:1998)
GB/T 229 Metal Charpy notch impact test method
Metallic Brinell hardness tests — Part 1: Test methods (GB/ T231.1-2002,eqv ISO 6506-1,1999)
GB/T669 mass carbon structural steel
Sampling position and sample preparation for mechanical properties test of GB/T2975 Steel and Steel Products (GB/T 2975-1998,eqv ISO 377:1997)
GB/T 13927 General valve pressure test (GB/T 13927-1992.neq ISO 5208:1982)
JB 4725 pressure vessel with carbon and low alloy steel forgings
JB 4730 pressure vessel nondestructive survey
ASTM A105/ A1055:2003 Carbon Steel forgings for Piping Parts
requirements
General Requirements
The forging material selection according to the provisions of Table 1, other materials with comparable properties can be used instead.
Table 1 Material grade
forging
The forging steel shall be steel.
The ingot shall have sufficient cutting ends to prevent harmful defects (including shrinkage, segregation, folding, etc.).
Forging shall ensure the full deformation of the forgings to meet the design and technical requirements.
During forging, the forgings should be ensured to cool slowly as they pass through the phase change temperature range.
After the forging is finally formed, it must be cooled to below 500℃ before the specified heat treatment can be carried out.
Heat treatment
Forgings with nominal pressure exceeding PN20 and flanges without pressure class must be heat treated.
The heat treatment methods are annealing, normalizing, or normalizing and tempering.
25. The heat treatment temperature of A105 steel can refer to the values in Table 2. Other materials shall refer to relevant standards.
Table 2 Heat treatment temperature
Chemical composition
The chemical composition shall meet the requirements of Table 3. Chemical composition of other materials according to GB/T 699 regulations.
Table 3 Chemical composition
When the specified carbon content is below 0.35%, for every 0.01I carbon content reduction, 0.06% manganese content is allowed to be added to the stipulated 1.05% manganese content until it is greater than 1.35%. The sum of Cu,Ni,Cr and Mo.v content should not exceed 1.0% Cr and the sum of Mo content should not exceed 0.32%
Post time: Nov-17-2022
