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Geological Drilling Pipes
Technique parameter:
Standard:
Q/OHAD006-2004 HengYang Composition
YB/T5052 Standard of China Metallurgical Industry
Application
For geological drilling
Grade and Chemical Composition(%):
Grade |
Designation |
Chemical Composition |
||||||||||
C |
Si |
Mn |
P |
S |
Cu |
Ni |
Cr |
Mo |
V |
B |
||
Max | ||||||||||||
DZ40 |
37Mn5 |
0.33~0.39 |
0.15~0.35 |
1.20~1.45 |
0.025 |
0.020 |
0.20 |
0.20 |
≤0.15 |
≤0.10 |
|
|
50Mn |
0.48~0.56 |
0.17~0.37 |
0.70~1.00 |
0.035 |
0.035 |
0.25 |
0.30 |
≤0.25 |
|
|
|
|
|
DZ50 DZ55 |
45Mn2 |
0.42~0.49 |
0.17~0.37 |
1.40~1.80 |
0.035 |
0.035 |
0.25 |
0.30 |
≤0.30 |
≤0.15 |
|
|
36Mn2V |
0.35~0.40 |
0.20~0.40 |
1.40~1.65 |
0.025 |
0.015 |
0.20 |
0.20 |
≤0.15 |
≤0.10 |
0.10~0.16 |
|
|
42MnMo7 |
0.40~0.46 |
0.15~0.35 |
1.60~1.85 |
0.025 |
0.015 |
0.20 |
0.20 |
≤0.15 |
0.15~0.25 |
|
|
|
|
STM— R780 |
36Mn2V |
0.35~0.40 |
0.20~0.40 |
1.40~1.65 |
0.025 |
0.015 |
0.20 |
0.20 |
≤0.15 |
≤0.10 |
0.10~0.16 |
|
42MnMo7 |
0.40~0.46 |
0.15~0.35 |
1.60~1.85 |
0.025 |
0.015 |
0.20 |
0.20 |
≤0.15 |
0.15~0.25 |
|
|
|
DZ60 |
45MnMoB |
0.41~0.49 |
0.17~0.37 |
0.90~1.20 |
0.030 |
0.030 |
0.25 |
0.25 |
≤0.25 |
0.20~0.30 |
≤0.08 |
0.001~0.005 |
25CrMnMo |
0.23~0.28 |
0.17~0.37 |
0.90~1.10 |
0.020 |
0.010 |
0.20 |
0.20 |
0.60~0.80 |
0.15~0.25 |
|
|
|
Note: pipes of other grades can also be provided as per agreement
Dimension Tolerances:
Allowed OD and Wall Thickness tolerances for pipes delivered as per Q/OHAD006-2004 .
OD |
Allowed Tolerance |
Wall Thickness |
Allowed Tolerance |
<50mm |
±0.40mm |
≤5mm |
+12%S -10%S |
50~100mm |
±1%D |
>5mm |
±10%S |
>100mm |
±1.00mm |
Allowed ID and Wall Thickness tolerances for pipes delivered as per Q/OHAD006-2004 .
Allowed ID tolerance |
Allowed Thickness tolerance |
|
+1.2%d -0.8%d |
±10%S |
Note: pipes with other thom the above-mentioned tolerances can also be provided with agreement.
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