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Chemical composition:
| Main and minor components | Min.content(%) | ASTM B760 |
| W | balance | balance |
| La | 0.77-0.94% | |
| La2O3 | 0.90-1.10% | |
| Impurities | Max.values (μg/g) | Max.values (μg/g) |
| Al | 15 | - |
| Cu | 10 | - |
| Cr | 20 | - |
| Fe | 30 | 100 |
| K | 10 | - |
| Ni | 20 | 100 |
| Si | 20 | 100 |
| Mo | 100 | - |
| C | 30 | 100 |
| H | 5 | - |
| N | 5 | 100 |
| Cd | 5 | - |
| Hg | 1 | - |
| Pb | 5 | - |
Diameter and tolerances:
| Diameter (mm) | Tolerance | ||
| Forged | Turned | Ground | |
| 1.20-1.99 | - | ±0.010 | |
| 2.00-2.99 | - | ±0.015 | |
| 3.00-15.9 | - | ±0.020 | |
| 16.0-24.9 | ±0.30 | ±0.030 | |
| 25.0-34.9 | ±0.40 | ±0.050 | |
| 35.0-39.9 | ±0.40 | ±0.30 | ±0.060 |
| 40.0-50.0 | ±0.40 | ±0.30 | ±0.20 |
| 50.0-80.0 | ±1.00 | ±0.40 | - |
Length and straightness:
| Diameter (mm) | Production length (mm) | Stiraightness/Meter (mm) | |
| Cleaned | Ground/turned | ||
| 1.20-10.0 | ≥500 | ＜2.5 | ＜2.5 |
| 10.1-50.0 | ≥300 | ＜2.0 | ＜1.5 |
| 50.1-80.0 | ≥100 | ＜2.0 | ＜1.5 |
Length tolerance:
|
Diameter 1.20-30.0 mm |
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| Nominal length (mm) | ≥15 | 15-120 | 120-400 | 400-1000 | 1000-2000 | ＞2000 |
| Length tolerance(mm) | ±0.2 | ±0.3 | ±0.5 | ±2.0 | ±3.0 | ±4.0 |
|
Diameter ＞30.0 mm |
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| Nominal length (mm) | ≥30 | 30-120 | 120-400 | 400-1000 | 1000-2000 | ＞2000 |
| Length tolerance(mm) | ±0.5 | ±0.8 | ±1.2 | ±4.0 | ±6.0 | ±8.0 |
Density:
| Diameter (mm) | Density (g/cm³) |
| 1.20-6.0 | 18.85 |
| 6.0-40.0 | 18.75 |
| 40.0-80.0 | 18.65 |
Nondestructive testing: For diameters＞15.00 mm: 100% ultrasonic testing. For diameters of 1.2-50.0mm: Eddy curent tests fro ground products visual inspection.
| Diameter(mm) | Hardness(HV 30) |
| 3.0-10.0 | ＞420 |
| 10.0-30.0 | ＞400 |
| 30.0-50.0 | ＞380 |
| ≥50 | ＞350 |
Surface condition:
| Diameter (mm) | Surface condition |
| ≤2.50 | ground Ra≤0.8μm |
| 2.50-30.0 | ground Ra≤1.0μm |
| 30.0-50.0 | ground Ra≤1.2μm |
| ≥50.0 | Turned Ra≤3.2μm |