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Technical requirements for ordering titanium for vessels

Views: 0     Author: Site Editor     Publish Time: 2022-08-29      Origin: Site

Technical requirements for ordering titanium for vessels

(1) The titanium used for vessels is based on the current titanium material standard, so the order should first meet the technical requirements in the titanium material standard

Since these titanium material standards are not special material standards for pressure vessels, but general material standards, only the technical requirements in the titanium material standards cannot meet the technical requirements of titanium for vessels, and supplementary technical requirements must be put forward The general supplementary technical requirements of titanium for vessels are proposed in this standard; The special supplementary technical requirements for titanium materials used for specific vessels shall be put forward in the vessel design drawings and technical documents. The technical requirements for ordering titanium for vessels shall be the sum of these three parts

(2) Deformed titanium for vessels shall be supplied in annealed state

In the current titanium product standards, only tubes and heat exchange tubes are supplied in annealed state, while the supply state in plate, rod and forging standards is selected by the purchaser. If the purchase contract does not specify the requirement for supply in annealed state, the supplier generally supplies in hot or cold working state.

It is specified in the bar and forging standards that the mechanical properties are tested on the specimen blank after heat treatment, that is, the mechanical properties of the specimen are qualified, which does not mean that the titanium material supplied is also annealed, nor does it mean that the titanium material supplied has reached the qualified mechanical properties listed in the warranty. It shall be required that the titanium material and the mechanical property sample shall be in the same annealing state, that is, the sample blank shall be cut from the titanium material or its extension part in the annealing state.

(3) Titanium for vessels shall ensure tensile strength at room temperature σ B) and specified residual elongation stress σ. R02 is the required technical requirement.

In some titanium material standards σ. R02 has no specific requirements, some are only as additional requirements, and some are only tested at the request of the demander (only for providing measured data, without guarantee). These cannot meet the requirements of titanium for vessels, and the purchase contract shall specify them as mandatory requirements. If the qualified index is not listed in the titanium material standard, the qualified index can be determined according to the qualified instructions listed in tables 4-1 to 4-5 of this standard or through negotiation. However, the maximum allowable tensile stress value also needs to be determined separately.

(4) Among the titanium product standards, only the heat exchange tube and forging standards have listed the non-destructive testing as the necessary technical requirements. If the user has no special requirements, the NDT requirements can be followed. Non destructive testing requirements are not mentioned in the titanium plate standard. Cd1308-87 puts forward five situations requiring ultrasonic testing of titanium plate.

1. The design temperature is lower than - 60

2. Design pressure exceeds 6

3. Used as inner cylinder of multi-layer pressure equipment;

4. Used as the lining of Sana'a pressure vessel and heat exchanger;

5. The thickness of titanium plate is more than 20mmbest titanium pipe - TIRONG TECH

(5) Considering that the non-destructive testing of steel plates in GB150 is mainly determined by the thickness of steel plates, the thickness of steel plates is easy to cause defects, and thick plates are generally used for occasions with large load, sometimes it is impossible to fully understand the application conditions of each titanium plate when ordering, so this standard only stipulates that titanium plates with a thickness of more than 20mm should be subject to ultrasonic testing, There is no uniform regulation on the application conditions under which NDT should be carried out. If necessary, it can be supplemented in the design drawings and technical documents

In addition, GB / t5193 ultrasonic testing method standard is only applicable to workpieces with a thickness of more than 13mm, and is not applicable to the detection of thin plates. Lamb wave ultrasonic testing method can be applied to titanium plates with a thickness of 0.5mm-13mm. However, Lamb wave ultrasonic testing method has not been listed as a formal standard, so there is no suitable testing method for thin titanium plates for lining Testing should not be generally prescribed Non destructive testing requirements are not listed in the general titanium pipe standard. This standard specifies that ultrasonic or eddy current testing shall be carried out when the design pressure exceeds 10MPa In the titanium rod standard, only ultrasonic nondestructive testing is considered as an additional technical requirement. This standard does not make uniform provisions, and it is determined by the design according to the specific situation

(6) The titanium pipe and titanium heat pipe standards specify that the manufacturing methods of the pipes are divided into rolling (drawing), welding and welding rolling. When ordering, which one should be indicated in the contract, because these pipes have different inspection technical requirements and different application properties (such as stress).

These five situations. The first four are the application conditions of titanium materials. Only the latter parameter belongs to the titanium plate itself.

Main physical properties of titanium metal top

Name: company data name: company data

Atomic number: 22, specific heat (cal / g): 0.138

Atomic weight 47.9 thermal expansion coefficient × 10-6/℃(0-100℃) 8.2

Gram atom volume (cm3 / gram atom) 10.7 elastic modulus

stretching

compress

Shear kg / mm2 10850

Midu 20 g / cm3 4.505 kg / mm2 10340

Melting point (℃): 1668 ± 4kg / mm2 10550

Boiling point (℃): 3535 kg / mm2 4500

Melting latent heat (kcal / mol): 5 thermal conductivity (kcal / cm / s) ℃ 0.036

Gasification latent heat (kcal / mole): 1125 ± 0.3%, resistance coefficient: × 10-6 ohm. Cm 47.8

Allotropic transformation temperature (℃): 882 (volume at transformation)

Change of% 5.5

Change of entropy during transformation (℃): 0.587 susceptibility × 10-6 ohm. Cm 3.2

Latent heat of transformation (kcal / mol): 678 ± 10%, Poisson's ratio: 0.41

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