Some standard content:
National Standard of the People's Republic of China
Titanium and titanium alloy bars
Titanium and titanium alloy bars1 Subject content and scope of application
GB/T 2965--1996
Replaces GB2965--87
This standard specifies the classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of titanium and titanium alloy bars. This standard applies to forged, extruded, rolled and cold drawn titanium and titanium alloy round bars and rectangular bars. Cited standards
Metal tensile test methods
GB2283
Titanium and titanium alloy grades and chemical compositions
GB/T 3620.1
GB/T 3620.2
Chemical composition and allowable deviation of composition of titanium and titanium alloy processed productsGB4338
GB4698
GB5168
GB5193
GB6395
GB6397
GB 8180
3 Product classification
Methods for high-temperature tensile test of metal materials
Chemical analysis methods for titanium sponge, titanium and titanium alloys High- and low-magnification microstructure inspection methods for two-phase titanium alloys Ultrasonic flaw detection methods for titanium and titanium alloy processed products Metal high-temperature tensile endurance test methods
Metal tensile test specimens
Packaging, marking, transportation and storage of titanium and titanium alloy processed products 3.1 Brand, manufacturing method, status and specifications The brand, manufacturing method, supply status and specifications of the product shall comply with the provisions of Table 1. Table 1
TA0, TA1.TA2, TA3,
TA5, TA6, TA7,
TA9,
TC1, TC2, TC3, TC4.
TC6,TC9.TC10.
(1)Hot forging
Manufacturing methodbzxz.net
(2)Hot forging + turning (polishing)
Hot extrusion turning (polishing)
Hot rolling turning (polishing)
(3)Cold rolling
Approved by the State Administration of Technical Supervision on November 4, 1996 Supply status
(1)Hot processing state| |tt||(2) Cold worked state
(3) Annealed state
Diameter or side length, mm
(1) Hot forging 8~200
(2) Hot extrusion 15～~80
(3) Hot rolling 8120
（4) Cold rolling, cold drawing
1997-04-01 implementation
3.2 Marking example
GB/T 2965—1996
3.2.1 Hot rolled round bars made of TC4 with a diameter of 50mm and a length of 2000mm are marked as: Bar TC4R rolled $50X2000GB2965
3.2.2 Hot forged rectangular bars made of TC4 with a side length of 50mm and a length of 2000mm are marked as: Rectangular bars TC4R forged 50X50X2000GB29653.2.3 Hot forged and polished round bars made of TC4 with a diameter of 50mm and a length of 2000mm Marked as: Bar TC4R Forged-turned $50X2000GB2965
3.2.4 Cold-drawn round bars with a diameter of 15mm and a length of 5000mm made of TC4 are marked as: Bar TC4Y Drawn $50×5000GB2965
4 Technical requirements
4.1 Chemical composition
The chemical composition of titanium and titanium alloy bars shall comply with the provisions of GB/T3620.1. When the purchaser re-tests, the allowable deviation of the chemical composition shall comply with the provisions of GB/T3620.2.
4.2 Allowable deviation of size
The diameter or side length and its allowable deviation of hot-worked bars shall comply with the provisions of Table 2. 4.2.1
Diameter or side length
Hot forged rod
>20~35
≥35~50
>80～125
>125～150
>150～200
Allowable deviation
Hot extruded rod
Hot rolled rod
4.2.2 The diameter and allowable deviation of hot-working turned (polished) rods and cold-rolled and cold-drawn rods shall comply with the provisions of Table 3. Table 3
>10～20
20～30
>30～50
≥50~~80
>80～100
>100~120
120160
>160～200
4.2.3 The out-of-roundness of hot-worked turned (polished) bars shall not be greater than half of their dimensional tolerance. 564
Allowable deviation
GB/T 2965-
--1996
4.2.4 The unfixed length of the tempered bars is 300～6000mm, and the unfixed length of the annealed bars is 300~2000mm. The fixed length or multiple length shall be within the range of the unfixed length. The allowable deviation of the fixed length is + 20mm; the multiple length should also include the cut of the bar, each cut is 5mm. The fixed length or multiple length should be specified in the contract. 4.2.5 The ends of the bar should be sawed flush. The bevel of the bar with a diameter or side length not exceeding 35mm should not exceed 3mm; the bevel of the bar with a diameter or side length greater than 35mm should not exceed 5mm.
4.3 Curvature of the bar
The curvature of the bar shall comply with the provisions of Table 4.
Manufacturing method
Hot working
Round bar turned (polished) after cold and hot working 4.4 Mechanical properties
Diameter or side length, mm
Curvature, mm/m not more than
The mechanical properties of the bar are tested on the heat-treated specimens. The heat treatment system of the bar is carried out in accordance with Appendix A. 4.4.1
The room temperature mechanical properties of bars with a cross-sectional area not exceeding 65cm* shall comply with the provisions of Table 5, and the high temperature mechanical properties shall comply with the provisions of Table 6. When the purchaser requires and specifies in the contract, the room temperature residual elongation stress αrn.2) and high temperature mechanical properties shall be tested. 4.4.3 For bars with a cross-sectional area of more than 65cm\, the measured data of transverse mechanical properties can be provided when the purchaser requires. The indicators shall be agreed upon by the supply and demand parties.
Room temperature mechanical properties, not less than
Tensile strength
Specified residual elongation stress
Elongation
Sectional shrinkage
Fire resistance
Aging properties
Tensile strength
Test temperature
GB/T2965—1996
Table 5 (end)
Room temperature mechanical properties, not less than
Specified residual elongation should Strength
Elongation
Reduction of area
High temperature mechanical properties, not less than
Tensile strength
Endurance strength
Forged bar properties
Rolled bar properties
Note: 1) If the endurance strength of TC11 alloy does not meet the requirements of this table, it is allowed to use the 100h endurance strength of 500C (aiah=590MPa) for inspection. After passing the inspection, the endurance strength of the batch of bars is also qualified. Ultrasonic flaw detection
If the bars need to be inspected by ultrasonic flaw detection, the acceptance level should refer to GB5193, negotiated by the supply and demand parties, and indicated in the contract. 4.6 Metallographic Structure
4.6.1 Macrostructure
The transverse macrostructure of the bar shall not have cracks, pores, metal or non-metal inclusions, segregation that affects the use and other metallurgical defects that can be seen by the naked eye.
4.6.2 Microstructure
GB/T2965--1996
When the purchaser has requirements for the microstructure, the supply and demand parties shall negotiate and indicate it in the contract. 4.7 Surface Quality
4.7.1 The surface of the bar is allowed to have minor scratches, indentations, pits and wrinkles that are not greater than half of the allowable deviation of the diameter or side length. 4.7.2 Local defects on the surface of the material can be removed, and the ratio of the width to the depth of the removed part should be greater than 6, and the depth of the removed part should meet the following requirements:
Bars for continued hot processing: The cleaning depth does not exceed the allowable deviation of the size. For bars for further cold processing (to be specified in the contract): the minimum size of the bars should be guaranteed after cleaning. 4.7.3 The surface roughness of the bars that require flaw detection should meet the requirements of flaw detection. 5 Test method
5.1 The chemical composition arbitration analysis of the bars shall be carried out in accordance with GB4698. 5.2 The room temperature tensile test of bars shall be carried out in accordance with GB228. The specimens for room temperature tensile test shall conform to specimen R7 in GB6397. 5.3 The high temperature tensile endurance test of bars shall be carried out in accordance with GB6395. 5.4 The high tensile test of bars shall be carried out in accordance with GB4338. 5.5 The ultrasonic flaw detection of bars shall be carried out in accordance with GB5193. 5.6 The metallographic structure inspection of bars shall be carried out in accordance with GB5168. 5.7 The dimensions of bars shall be inspected with measuring tools of corresponding accuracy. 5.8 The surface quality of bars shall be inspected by visual inspection. 6 Acceptance rules
6.1 Inspection and acceptance
6.1.1 The bars shall be inspected by the technical supervision department of the supplier to ensure that the product quality meets the requirements of this standard and fill in the quality certificate. 6.1.2 The purchaser shall promptly accept the received products in accordance with the provisions of this standard. If the inspection results do not meet the provisions of this standard, they shall be reported to the supplier within three months from the date of receipt of the product and the supply and demand parties shall negotiate to resolve the problem. 6.2 Batches
Bars should be submitted for inspection in batches. Each batch of bars should be made of bars of the same brand, smelting furnace number, specification, manufacturing method and state. 6.3 Inspection items
Each batch of bars should be inspected for chemical composition, size, mechanical properties, surface quality and macrostructure. 6.4 Sampling location and quantity
6.4.1 Hydrogen content is sampled from any one of the finished bars for analysis. The supplier shall report other chemical compositions with the analysis results of the ingot. The buyer shall sample and analyze the finished bars for re-inspection.
6.4.2 For bars with a cross-sectional area of less than 65cm2, two bars are randomly selected from each batch, and one longitudinal sample is taken from each bar for mechanical property inspection according to the inspection items; for bars with a cross-sectional area of more than 65cm2, one bar is randomly selected from each batch, and two transverse samples are taken from each bar for mechanical property inspection according to the inspection items.
6.4.3 Macroscopic and microstructure of bars Take one bar from each batch of bars and cut a transverse specimen for inspection. 6.4.4 The size and surface quality of bars shall be inspected one by one. 6.4.5 Bars that require ultrasonic testing shall be inspected one by one. 6.5 Repeated test
In the chemical composition and mechanical properties test items, if one of the test results of the specimen is unqualified, double the specimens shall be taken from the batch of bars for repeated inspection of the unqualified item; if one of the specimens is still unqualified after the repeated inspection, the batch of bars is unqualified, and it is allowed to be inspected one by one. The qualified ones shall be re-batch for acceptance. 567
Packaging, marking, transportation and storage
7.1 Product marking
GB/T2965-1996
The following markings shall be made on the inspected bars or packaging boxes: a. Brand;
b. Melting furnace number.
7.2 Packaging, packaging marking, transportation, storage
The packaging, packaging marking, transportation and storage of bars shall comply with the provisions of GB8180. 7.3
Quality certificate
Each batch of bars shall be accompanied by a quality certificate, indicating: a.
Name and address of the supplier;
Product name;
Product brand, specification and state;
Smelting furnace number, batch number and number of pieces, weight: the specified analysis and test results and the stamp of the technical supervision department, this bid number;
Packing date.
CB/T 2965--1996
Appendix A
Heat treatment system for titanium and titanium alloy bars
Reference)
Heating temperature, holding time, cooling method600~700℃, 13h, air cooling
600~～700℃1～3 h, air cooling
600～700℃, 1～3 h, air cooling
600～700℃, 1～3 h, air cooling
700～850℃, 1~3 h, air cooling
750～850, 1～3 h, air cooling
750~850℃, 1～3 h, air cooling
600~700℃,1~3h, air cooling
600~700℃,1~3 h, air cooling
(1) Quenching: 800~850℃, 30min. Air cooling or water cooling(2) Aging: 450~500℃, 8h, air cooling700~850℃,1~3h, air cooling
700~850℃,1~3 h, air cooling
700~800℃,1~3 h, cooling
700~800℃,1~3 h, air cooling
870±10℃,1~3hFurnace cooling to 650℃, 2h, air cooling950~1000℃,1~3h, air cooling+530±10C,6 h, air cooling 700~800℃, 1~3 h, air cooling
950±10℃, 1~3h, air cooling +530±10℃, 6h, air cooling 700~850℃, 1~3h, air cooling
Note: The first annealing temperature of TC11 is allowed to be adjusted within 30~50C below the β transformation temperature. Additional instructions:
This standard is proposed by China Nonferrous Metals Industry Corporation. This standard is under the jurisdiction of the Standard Metrology Institute of China Nonferrous Metals Industry Corporation. This standard was drafted by the Titanium Alloy Research Branch of Shanghai Iron and Steel Research Institute. The main drafters of this standard are Huang Liping, Feng Yinglei, Gui Jun, and Yang Lijuan. 569Air cooling
600～700℃,1～3h,air cooling
700～850℃,1~3 h,air cooling
750～850,1～3 h,air cooling
750~850℃,1～3 h,air cooling
600~700℃,1～3h,air cooling
600～700℃,1～3 h,air cooling
(1)Quenching: 800～850℃, 30min.Air cooling or water cooling(2)Aging: 450～500℃, 8h,air cooling700~850℃,1~3h,air cooling
700～850℃,1～3 h,air cooling
700～800℃,1～3 h, cooling
700～800℃,1～3 h, air cooling
870±10℃,1～3h furnace cooling to 650℃,2h, air cooling950～1000℃,1～3h, air cooling+530±10C,6 h, air cooling700~800℃,1~3 h, air cooling
950±10℃，1～3h, air cooling+530±10℃，6h, air cooling700~850℃,1~3h, air cooling
Note: The first annealing temperature of TC11 is allowed to be adjusted within 30～50℃ below the β transformation temperature. Additional remarks:
This standard is proposed by China Nonferrous Metals Industry Corporation. This standard is under the jurisdiction of the Standard Metrology Institute of China Nonferrous Metals Industry Corporation. This standard is drafted by the Titanium Alloy Research Branch of Shanghai Iron and Steel Research Institute. The main drafters of this standard are Huang Liping, Feng Yinglei, Gui Jun and Yang Lijuan.Air cooling
600～700℃,1～3h,air cooling
700～850℃,1~3 h,air cooling
750～850,1～3 h,air cooling
750~850℃,1～3 h,air cooling
600~700℃,1～3h,air cooling
600～700℃,1～3 h,air cooling
(1)Quenching: 800～850℃, 30min.Air cooling or water cooling(2)Aging: 450～500℃, 8h,air cooling700~850℃,1~3h,air cooling
700～850℃,1～3 h,air cooling
700～800℃,1～3 h, cooling
700～800℃,1～3 h, air cooling
870±10℃,1～3h furnace cooling to 650℃,2h, air cooling950～1000℃,1～3h, air cooling+530±10C,6 h, air cooling700~800℃,1~3 h, air cooling
950±10℃，1～3h, air cooling+530±10℃，6h, air cooling700~850℃,1~3h, air cooling
Note: The first annealing temperature of TC11 is allowed to be adjusted within 30～50℃ below the β transformation temperature. Additional remarks:
This standard is proposed by China Nonferrous Metals Industry Corporation. This standard is under the jurisdiction of the Standard Metrology Institute of China Nonferrous Metals Industry Corporation. This standard is drafted by the Titanium Alloy Research Branch of Shanghai Iron and Steel Research Institute. The main drafters of this standard are Huang Liping, Feng Yinglei, Gui Jun and Yang Lijuan.
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