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Titanium alloys can be divided into three categories according to the composition of phases: α alloys, (α+β) alloys and β alloys, which are represented by TA, TC, and TB in China.
① The α alloy contains a certain amount of elements that stabilize the α phase, and the equilibrium state is mainly composed of the α phase. α alloy has small specific gravity, good thermal strength, good weldability and excellent corrosion resistance. The disadvantage is low strength at room temperature, and it is usually used as heat-resistant and corrosion-resistant materials. α alloys can usually be divided into full α alloys (TA7), near α alloys (Ti-8Al-1Mo-1V) and α alloys with a small amount of compounds (Ti-2.5Cu). ② (α+β) alloy contains a certain amount of elements that stabilize the α phase and β phase, and the structure of the alloy in the equilibrium state is α phase and β phase. (α+β) alloy has medium strength and can be strengthened by heat treatment, but its welding performance is poor. (α+β) alloys are widely used, and the output of Ti-6Al-4V alloy accounts for more than half of all titanium materials.
③ The β alloy contains a large amount of elements that stabilize the β phase, which can keep all the high temperature β phase at room temperature. β alloys can usually be divided into heat treatable β alloys (metastable β alloys and near metastable β alloys) and thermally stable β alloys. Heat treatable β alloy has excellent plasticity in the quenched state, and the tensile strength can reach 130-140kgf/mm2 through aging treatment. β alloys are usually used as high-strength and high-toughness materials. The disadvantages are large specific gravity, high cost, poor welding performance and difficult cutting process.
American Standard grades: GR1, GR2, GR3, GR5, GR7, GR12
National standard: GB/T2965-2007, GB/T13810, Q/BS5331-91
American Standard:ASTM B348、ASTM F136、ASTM F67、AMS4928
I. Reference standards
1 : GB 228 metal tensile test method
2: GB/T 3620.1 Titanium and titanium alloy grades and chemical composition
3: GB/T3620.2 Titanium and titanium alloy processed products chemical composition and composition allowable deviation
4: GB 4698 sponge titanium, titanium and titanium alloy chemical analysis methods
Second, technical requirements
1: The chemical composition of titanium and titanium alloy bars should comply with GB/T 3620.1, the provisions of the need for repeated testing, the allowable deviation of the chemical composition should comply with the provisions of GB/T 3620.2.
2: The diameter or edge length of the hot-processed bar and its allowable deviation should be in line with the provisions of Table 1.
3: After hot processing by turning (grinding) polished bars and cold-rolled, cold-drawn bars should meet the allowable deviation of the diameter of the provisions of Table II.
4: After hot processing by turning (grinding) polished bars should not be more than half of its size tolerance.
5: Processing state of the bar's indefinite length of 300-6000mm, annealed state of the bar indefinite length of 300-2000mm, fixed length or times the length of the bar should be within the indefinite length. The allowable deviation of the fixed length is +20mm; the multi-length should also take into account the cut of the bar, each cut amount is 5mm.
KUAIMA | Typical corresponding standard | Chemical composition(wt%) | ||||||||
N | C | H | Fe | O | Al | V | Ti | Other elements | ||
DT1 | JIS Class 1 | ≦0.03 | ≦0.08 | ≦0.013 | ≦0.20 | ≦0.15 | - | - | Bal | |
ASTM Grade 1 | ≦0.03 | ≦0.08 | ≦0.015 | ≦0.20 | ≦0.18 | - | - | Bal | ||
DIN3.7025 | ≦0.05 | ≦0.06 | ≦0.013 | ≦0.15 | ≦0.12 | - | - | Bal | ||
DT2 | JIS Class 2 | ≦0.03 | ≦0.08 | ≦0.013 | ≦0.25 | ≦0.20 | - | - | Bal | |
ASTM Grade 2 | ≦0.03 | ≦0.08 | ≦0.015 | ≦0.30 | ≦0.25 | - | - | Bal | ||
DIN3.7035 | ≦0.05 | ≦0.06 | ≦0.013 | ≦0.20 | ≦0.18 | - | - | Bal | ||
DT3 | JIS Class 3 | ≦0.05 | ≦0.08 | ≦0.013 | ≦0.30 | ≦0.30 | - | - | Bal | |
ASTM Grade 3 | ≦0.05 | ≦0.08 | ≦0.015 | ≦0.30 | ≦0.35 | - | - | Bal | ||
DIN3.7055 | ≦0.05 | ≦0.06 | ≦0.013 | ≦0.25 | ≦0.25 | - | - | Bal | ||
DT4 | JIS Class 4 | ≦0.05 | ≦0.08 | ≦0.013 | ≦0.50 | ≦0.40 | - | - | Bal | |
ASTM Grade 4 | ≦0.05 | ≦0.08 | ≦0.015 | ≦0.50 | ≦0.40 | - | - | Bal | ||
DIN3.7065 | ≦0.05 | ≦0.06 | ≦0.013 | ≦0.30 | ≦0.35 | - | - | Bal |
KUAIMA | Typical corresponding standard | Chemical composition(wt%) | ||||||||
N | C | H | Fe | O | Al | V | Ti | Other elements | ||
DAT5 | JIS Class 60 | ≦0.05 | ≦0.08 | ≦0.015 | ≦0.40 | ≦0.20 | 5.50~ 6.75 | 3.50~ 4.50 | Bal | |
ASTM Grade 5 | ≦0.05 | ≦0.08 | ≦0.015 | ≦0.40 | ≦0.20 | 5.5~ 6.75 | 3.5~ 4.5 | Bal | ||
DIN3.7164 | ≦0.05 | ≦0.08 | ≦0.0125 | ≦0.30 | ≦0.20 | 5.5~ 6.75 | 3.5~ 4.5 | Bal | ||
AMS 4928 | ≦0.05 | ≦0.08 | ≦0.0125 | ≦0.30 | ≦0.20 | 5.50~ 6.75 | 3.50~ 4.50 | Bal | Y≦0.005 | |
DAT5E | JIS Class 60E | ≦0.03 | ≦0.08 | ≦0.0125 | ≦0.25 | ≦0.13 | 5.50~ 6.50 | 3.50~ 4.50 | Bal | |
ASTM F136 | ≦0.05 | ≦0.08 | ≦0.012 | ≦0.25 | ≦0.13 | 5.5~ 6.50 | 3.5~ 4.5 | Bal | ||
AMS 4930 | ≦0.05 | ≦0.08 | ≦0.0125 | ≦0.25 | ≦0.13 | 5.50~ 6.50 | 3.50~ 4.50 | Bal | Y≦0.005 | |
DAT67 | ASTM F1295 | ≦0.05 | ≦0.08 | ≦0.009 | ≦0.25 | ≦0.20 | 5.50~ 6.50 | - | Bal | Nb 6.50~7.50 |
Ta≦0.50 | ||||||||||
DAT52 | JIS Class 61 | ≦0.03 | ≦0.08 | ≦0.015 | ≦0.25 | ≦0.15 | 2.50~ 3.50 | 2.00~ 3.00 | Bal | |
ASTM Grade 9 | ≦0.03 | ≦0.08 | ≦0.015 | ≦0.25 | ≦0.12 | 2.5~ 3.5 | 2.0~ 3.0 | Bal | ||
DAT52F | JIS Class 61F | ≦0.05 | ≦0.10 | ≦0.015 | ≦0.30 | ≦0.25 | 2.70~ 3.50 | 1.60~ 3.40 | Bal | S 0.05~0.20 |
(Material for free cutting) | REM 0.05~0.70 | |||||||||
DAT51 | JIS Class 80 | ≦0.05 | ≦0.10 | ≦0.015 | ≦1.00 | ≦0.25 | 3.50~ 4.50 | 20.0~ 23.0 | Bal | |
(Material for cold working) | ||||||||||
DAT54 | Daido original standard | ≦0.05 | ≦0.20 | ≦0.015 | ≦1.00 | ≦0.25 | 5.5~ 6.5 | - | Bal | Si 0.2~0.7 |
Mo 2.5~3.5 | ||||||||||
Sn 3.0~4.5 | ||||||||||
Zr 3.0~4.0 | ||||||||||
Nb 0.4~1.0 | ||||||||||
DAT55G | Daido original standard | ≦0.05 | ≦0.10 | ≦0.015 | ≦1.00 | ≦0.25 | 3.5~ 4.5 | 15.0~ 17.0 | Bal | Cr 5.0~7.0 |
DAT56M | Daido original (CATi) | ≦0.05 | ≦0.10 | ≦0.015 | 0.4~1.5 | ≦0.30 | 2.5~ 3.5 | - | Bal | Cr 12.5~14.5 |
DAT57M | Daido original (VLTi) | ≦0.05 | ≦0.10 | ≦0.015 | 0.4~1.5 | ≦0.30 | 5.5~ 6.5 | - | Bal | |
ASTM Grade41 | ||||||||||
DAT15G | AMS4914 | ≦0.05 | ≦0.05 | ≦0.015 | ≦0.25 | ≦0.13 | 2.5~ 3.5 | 14.0〜 16.0 | Bal | Cr 2.5〜3.5 |
Sn 2.5〜3.5 |
KUAIMA | Typical corresponding standard | Tensile strength | 0.2% Yield strength | Elongation | Reduction of area | 180° bending | Hardness | Heat treatment condition |
BRAND | (N/mm2) | (N/mm2) | (%) | (%) | (inner radius) | (HB) | ||
DT1 | JIS Class 1 | 270~410 | ≧165 | ≧27 | - | 2T | ≧100 | Annealing |
ASTM Grade 1 | ≧240 | ≧138 | ≧24 | ≧30 | - | - | Annealing | |
DIN3.7025 | 290~410 | ≧180 | ≧30 | - | - | - | Annealing | |
DT2 | JIS Class 2 | 340~510 | ≧215 | ≧23 | - | 2T | ≧110 | Annealing |
ASTM Grade 2 | ≧345 | ≧275 | ≧20 | ≧30 | - | - | Annealing | |
DIN3.7035 | 390~540 | ≧250 | ≧22 | - | - | - | Annealing | |
DT3 | JIS Class 3 | 480~620 | ≧345 | ≧18 | - | 3T | ≧150 | Annealing |
ASTM Grade 3 | ≧450 | ≧380 | ≧18 | ≧30 | - | - | Annealing | |
DIN3.7055 | 460~590 | ≧320 | ≧18 | - | - | - | Annealing | |
DT4 | JIS Class 4 | 550~750 | ≧485 | ≧15 | - | 3T | ≧180 | Annealing |
ASTM Grade 4 | ≧550 | ≧483 | ≧15 | ≧25 | - | - | Annealing | |
DIN3.7065 | 540~740 | ≧390 | ≧16 | - | - | - | Annealing |
KUAIMA | Typical corresponding standard | Tensile strength | 0.2% Yield strength | Elongation | Reduction of area | 180° bending | Hardness | Heat treatment condition |
BRAND | (N/mm2) | (N/mm2) | (%) | (%) | (inner radius) | (HB) | ||
DAT5 | JIS Class 60 | ≧895 | ≧825 | ≧10 | ≧25 | - | - | Annealing |
ASTM Grade 5 | ≧895 | ≧828 | ≧10 | ≧25 | - | - | Annealing | |
DIN3.7164 | ≧900 | ≧830 | ≧10 | ≧25 | - | - | Annealing | |
AMS 4928 | ≧896 | ≧827 | ≧10 | ≧25 | - | - | Annealing | |
DAT5E | JIS Class 60E | ≧825 | ≧755 | ≧10 | ≧25 | - | - | Annealing |
ASTM F136 | ≧860 | ≧795 | ≧10 | ≧25 | - | - | Annealing | |
AMS 4930 | ≧827 | ≧758 | ≧8 | ≧15 | - | - | Annealing | |
DAT67 | ASTM F1295 | ≧900 | ≧800 | ≧10 | ≧15 | - | - | Annealing |
DAT52 | JIS Class 61 | ≧620 | ≧485 | ≧15 | ≧30 | - | - | Annealing |
ASTM Grade 9 | ≧620 | ≧483 | ≧15 | ≧25 | - | - | Annealing | |
DAT52F | JIS Class 61 | ≧650 | ≧600 | ≧10 | ≧25 | - | - | Annealing |
(Material for free cutting) | ||||||||
DAT51 | JIS Class 80 | 640~900 | ≦850 | ≧10 | ≧55 | - | - | Solution |
(Material for cold working) | ||||||||
DAT54 | Daido original standard | ≧895 | ≧825 | ≧5 | ≧10 | - | - | Annealing |
DAT55G | Daido original standard | 770~1050 | ≦1000 | ≧10 | ≧25 | - | - | Solution |
DAT56M | Daido original (CATi) | 850~1100 | ≦1050 | ≧10 | ≧25 | - | - | Solution |
DAT57M | Daido original (VLTi) | ≧895 | ≧825 | ≧10 | ≧25 | - | - | Annealing |
ASTM Grade41 | ||||||||
DAT15G | AMS 4914 | 703〜 745 | 689〜 869 | ≧12 | - | - | - | Solution |
Dimensions (mm) | Tolerance(mm) | Ovality (mm) |
6.35 to 7.94 | ±0.13 | 0.20 |
7.94 to 11.11 | ±0.15 | 0.23 |
11.11 to 15.88 | ±0.18 | 0.25 |
15.88 to 22.22 | ±0.20 | 0.30 |
22.22 to 25.40 | ±0.23 | 0.33 |
25.40 to 28.58 | ±0.25 | 0.38 |
28.58 to 31.75 | ±0.28 | 0.41 |
31.75 to 34.92 | ±0.30 | 0.46 |
34.92 to 38.10 | ±0.36 | 0.53 |
38.10 to 50.80 | ±0.40 | 0.58 |
50.80 to 63.50 | +0.79, − 0 | 0.58 |
63.50 to 88.90 | +1.19, − 0 | 0.89 |
88.90 to 114.30 | +1.59, − 0 | 1.17 |