Titanium Alloy Materials and Welding Specifications – Shanghai Zuudee Titanium Industry
Titanium alloy plate
1. Scope of application
1. The provisions of this section are applicable to titanium alloy plates with a thickness of 3mm and above for ships or marine engineering.
2. For the use of titanium alloy plates other than those specified in this section, the chemical composition, mechanical properties and application information are to be submitted to CCS for review. After approval, they can be accepted in accordance with recognized relevant standards.
two manufacturing
1. Titanium alloy plates are to be produced by factories approved by CCS.
2. Except for the provisions of this Section, the manufacture and testing of titanium alloys are to comply with the relevant provisions of Chapters 1 and 2 of this PART.
3. The melting of titanium alloy should be carried out under vacuum conditions. If a vacuum consumable furnace is used for remelting and smelting, the consumable electrode must not be welded by argon tungsten arc welding, and the number of melting times should not be less than 2 to ensure the chemical uniformity of the material.
4. Titanium alloy plates should usually be manufactured by rolling.
5. Unless specified in the contract, titanium alloy plates are usually delivered in an annealed state.
Three surface quality
1. There should be no defects on the surface of the board that affect the use, such as cracks, peeling, scale, wrinkles, metal or non-metal inclusions, traces of over-alkali washing, etc.
2. Product edges of titanium alloy plates are to be flush and free of burrs, and the external dimensions and tolerance range are to comply with the relevant technical conditions accepted by CCS.
3. Minor surface imperfections are allowed to be removed by grinding. Grinding should generally be carried out in the rolling direction, and the surface after grinding should form a smooth transition, and the thickness should not be lower than the minimum thickness specified in the technical conditions. Repairing of surface defects by means of welding repair is not allowed.
Four chemical composition
Titanium alloy ingot casting plants should analyze the melting chemical composition of each furnace product. The chemical composition should meet the requirements in Table 1.
Table 1 Chemical composition of titanium alloys (%)
Specifications for Titanium Alloy Materials and Welding--Shanghai Zuudee Titanium Co., Ltd.
Note: Except for the data in the table, the other values are the upper limit.
Five mechanical properties
1. At least one plate should be selected from each batch (same heat number, same manufacturing method, same thickness, same heat treatment heat) (when there are more than 4 plates in a batch, 2 plates should be drawn), and in the plate Cut a sample at about 1/4 of the board width from the end of the board.
2. One tensile specimen, one set of three Charpy impact specimens (for plate thickness greater than 10mm) and two bending specimens shall be obtained from each specimen according to the following requirements:
(1) The tensile test specimens are to be plate-shaped proportional specimens with serial number 1 in Table 2.2.2.1 of Chapter 2 of this PART (but the specimen width may be 12.5mm P7 specimens); serial numbers may also be used for those with a thickness greater than 40mm. 2 for a round bar-shaped sample (but the sample diameter may be 5mm), at this time the axis of the sample should be located at 1/4 of the thickness of the plate;
(2) When the thickness of the plate is not greater than 40mm, the impact test sample shall be at a position not greater than 2mm from the edge of the test plate to the rolling surface of the plate; if the thickness of the product exceeds 40mm, the axis of the test sample shall be located at 1/4 of the thickness of the plate . The axis of the sample should be perpendicular to the rolling direction, and the notch of the sample should be perpendicular to the rolling surface;
(3) The tensile surfaces of the two bending specimens are to maintain at least one original rolling surface, and their axes are to be perpendicular to the rolling direction. The width of the sample is 15mm, and for a plate with a thickness exceeding 5mm, it can be thinned to 5mm on one side.
3. The specimen preparation and test for mechanical properties are to be carried out in accordance with the relevant provisions of Chapter 2 of this PART. The bend test shall be such that both rolled sides of the plate are tested.
4. The mechanical properties of titanium alloys should meet the requirements in Table 2.
Table 2 Mechanical properties of titanium alloys
Specifications for Titanium Alloy Materials and Welding--Shanghai Dizhu Titanium Co., Ltd.
Six non-destructive testing
1. If the contract stipulates that non-destructive testing should be carried out on the board, non-destructive testing should be carried out according to the requirements of the contract.
Seven logos and certificates
1. The plate manufacturer shall clearly mark the CCS inspection mark and the following marks on each titanium plate (thin plates can be stacked and packaged) that pass the inspection:
(1) The name of the manufacturer;
(2) The grade and delivery status of the material;
(3) The number or abbreviation that can trace the entire production process of titanium materials;
(4) If requested by the ordering party, the order contract number or other identification marks can be marked.
2. Each batch of boards should be accompanied by a material certificate. The certificate of conformity shall at least include the following contents:
(1) The name of the ordering party and the contract number;
(2) The grade, batch number and delivery status of the material;
(3) Specifications and quantities of materials;
(4) Chemical composition and mechanical properties of materials.
Titanium and titanium alloy tubes
1. General provisions
1. The regulations in this section apply to titanium and titanium alloy pipes for general purposes in ships and marine engineering.
2. For the use of titanium and titanium alloy pipes other than those specified in this section, their chemical composition, mechanical properties and application are to be submitted to CCS for review. After approval, they can be accepted in accordance with recognized relevant standards.
two manufacturing
1. Titanium and titanium alloy pipes are to be produced by factories approved by CCS.
2. In addition to the provisions of this Section, the manufacture and testing of titanium alloy pipes are to comply with the relevant provisions of Chapters 1, 2 and 4 of this PART.
3. The smelting of titanium and titanium alloys should be carried out under vacuum conditions. If a vacuum consumable furnace is used for remelting, 2 or more remelting processes should be used to ensure the uniformity of chemical composition and structure of the material, and to reduce the level of oxidized and nitrided inclusions.
4. Titanium alloy tubes can be manufactured by rolling, welding or welding and rolling.
5. The welded pipe can be welded by TIG welding or MIG method after rolling the annealed rolled strip. If filler material is required, the filler material used shall be compatible with the parent material.
6. The manufacturing quality of titanium and titanium alloy pipes shall comply with the relevant provisions of 4.1.3, Chapter 4 of this PART of this Code.
Three heat treatment
1. Unless otherwise specified in the contract, titanium and titanium alloy pipes shall be delivered in an annealed state.
2. For cold-rolled tubes, annealing should generally be carried out at a temperature not lower than 540°C; for hot-rolled tubes, if the processing termination temperature is not lower than 760°C, no further heat treatment is required.
Four chemical composition
Titanium alloy ingot casting plants should analyze the melting chemical composition of each furnace product. The chemical composition should meet the requirements in Table 3.
Table 3 Chemical composition of titanium and titanium alloy tubes (%)
Note: Except for the data in the table, the other values are the upper limit.
Five mechanical properties
1. Titanium tubes and titanium alloy tubes can be inspected and tested in batches. Each batch of pipes shall consist of titanium pipes of the same heat number, same manufacturing method, same specification, and same heat treatment heat.
Randomly select no less than 2 pipes at a rate of 2% from each batch of pipes, and carry out sampling tests according to the following requirements:
(1) One tensile test piece and one flattening test piece are to be taken from each pipe;
(2) When required by the purchaser, a bending test piece shall be taken from each pipe.
2. Specimens and tests for tensile and flattening tests are to comply with the relevant provisions of Chapter 2 of this PART. During the flattening test, when the pipe diameter is less than or equal to 25.4mm, the flattening coefficient is taken as 0.04; when the pipe diameter is greater than 25.4mm, the flattened coefficient is taken as 0.06. For TA10 alloy, the flattening factor is taken as 0.04.
3. The mechanical properties of titanium and titanium alloy pipes should meet the requirements in Table 4.
Table 4 Mechanical properties of titanium and titanium alloy tubes
Six non-destructive testing and hydraulic testing
1. All titanium and titanium alloy pipes should be subjected to non-destructive testing and hydraulic testing at the manufacturer. 2. Non-destructive testing can be carried out by eddy current or ultrasonic testing according to the provisions of recognized standards (such as GB/T 12969).
3. If there is no contract, the hydraulic test pressure can be determined according to the following formula. But generally, for pipes with a diameter not exceeding 76mm, the test pressure does not need to exceed 17.2MPa; for pipes with a diameter exceeding 76mm, the test pressure does not need to exceed 19.3MPa.
In the formula: P - test pressure, MPa;
k - test pressure coefficient, take 1 for seamless pipes and 0.85 for welded pipes;
S ——The allowable stress of the pipe, generally taken as 50% of the minimum value of the specified non-proportional tensile strength of the material, MPa;
t - pipe wall thickness, mm;
D - the nominal outer diameter of the pipe, mm.
4. During the hydraulic test, the test pressure should be maintained for at least 5s, and the pipe should not be distorted or leaked.
Seven logos and certificates
1. The manufacturer is to clearly mark the CCS logo and the following marks on each titanium tube or titanium alloy tube that has passed the inspection:
(1) Manufacturer name or trademark;
(2) The grade and specification of the material;
(3) The number or abbreviation that can trace the entire production process of titanium tubes.
2. Each batch of tubes should be accompanied by a material certificate. The certificate of conformity shall at least include the following contents:
(1) The name of the ordering party and the contract number;
(2) The grade, batch number and delivery status of the material;
(3) Specifications and quantities of materials;
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