API 7-1 Non-magnetic drill collar forging
API certificated non-magnetic drill collar forging
1.HHF's non-magnetic products include non-magnetic drill collar, non-magnetic flex collar, non-magnetic stabilizer,etc.
2.Strict control of chemical composition and low temperature forging guarantee the exnt mechanical properties of our non-magnetic products.
3.Tensile strength is 10 to 20 percent higher than the requirement of API Spec7-1.
4.Minimum Brinell hardness is above 285 and minimum impact value is over 130 Joules.
5.Our non-magnetic products are highly corrosion-resistant , which greatly extends the service life of drilling tools in a corrosive atmosre.
6.The maximum relative magnetic permeability of non-magnetic tools can be controlled to less than 1.005, which increases the accuracy of measurements taken during directional drilling.
7.Mechanical properties specified according to API Spec7-1 are as followings:
Chemical composition of non-magnetic drill collar forging :
Material | Chemical composition % | ||||||
C | Si | Cr | Mn | Ni | Mo | N | |
W-1 | 0.08 max | 0.8 max | 13.5-16.5 | 16.0-18.5 | 1.0-3.0 | 0.40-0.85 | 0.25-0.40 |
W-2 | 0.03 max | 0.8 max | 13-16 | 18.5-22.0 | 1.0-3.0 | 0.4-0.80 | 0.30-0.45 |
W-3 | 0.03 max | 0.8 max | 16.5-18.5 | 18.5-22.0 | 1.0-3.0 | 0.4-0.80 | 0.50-0.80 |
Mechanical properties of non-magnetic drill collar forging:
Material | OD range | Yield strength | Tensile strength | Elongation A% | Charpy V value | Hardness (HB) | |||
mm | MPa | ksi | MPa | ksi | 21℃ | -25℃ | |||
W-1 | 79.4-174.6 | ≥758 | ≥110 | ≥827 | ≥120 | ≥20 | ≥85 | ≥40 | 285-400 |
177.8-279.4 | ≥689 | ≥100 | ≥758 | ≥110 | |||||
W-2 | 79.4-174.6 | ≥827 | ≥120 | ≥896 | ≥130 | ≥25 | ≥150 | ≥40 | 285-365 |
177.8-279.4 | ≥758 | ≥110 | |||||||
W-3 | 79.4-174.6 | ≥965 | ≥140 | ≥1034 | ≥150 | ≥20 | ≥100 | ≥40 | 300-400 |
177.8-279.4 | ≥896 | ≥130 | |||||||
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