Highlight:
seamless steel oil well pipe
, 30CrMnSiA steel casting tube
, low residual hoop stresses pipe
GB/T 9808 Seamless Steel Oil Well Pipe 30CrMnSiA Steel Casting Tube with Low residual Hoop Stresses
30CrMnSiA Grade Drilling Pipe – High-Strength, Corrosion-Resistant & Weldable for Demanding Wells
Engineered for medium-high pressure, weakly corrosive, and dynamic-loading well environments, 30CrMnSiA grade drilling pipe delivers exceptional strength, corrosion resistance, and weldability — making it the reliable choice for challenging oilfield applications.
Key Features & Benefits
1. High Strength
Tensile strength ≥850 MPa – Outperforms standard carbon steels, ensuring reliable performance in high-pressure wells (35–50 MPa) and critical structural applications (e.g., deep casing).
2. Corrosion Resistance
0.80–1.10% Chromium – Forms a protective oxide layer to resist brine, CO₂, and weakly acidic fluids, surpassing non-alloy carbon steels (e.g., 1541) in moderately corrosive environments (e.g., water injection wells, offshore fields).
3. Weldable Design
Low carbon equivalent (Ceq) – Enables low-preheat, post-weld heat treatment (PWHT)-free field welding, reducing downtime and simplifying on-site operations (e.g., casing connections, repairs).
4. Balanced Toughness
Elongation ≥14% – Absorbs dynamic loads (drill bit vibrations, pressure pulses), minimizing crack propagation and extending service life.
5. Lightweight & Efficient
Lighter than 4140 steel – Reduces tripping loads in deep/extended-reach wells without sacrificing strength.
Why 30CrMnSiA?
1. Better Than 1541 – Superior corrosion resistance for moderately corrosive wells (e.g., injection, offshore).
2. Cost-Effective Alternative to 4140/4130 – Delivers high strength (near 4130) and weldability at a lower alloy cost than premium grades (e.g., 4140).
3. Versatile Performance – Ideal for weld-intensive operations, dynamic-loading wells, and corrosion-sensitive environments.
Perfect for: Medium-high pressure wells, weakly corrosive formations, welding-heavy applications.
For extreme pressures, choose 4140; for shallow/budget wells, consider 1541.
Chemical Composition
| Steel Grade |
C |
Si |
Mn |
P |
S |
Cr |
Mo |
B |
| 4130 |
0.28-0.33 |
0.15-0.35 |
0.40-0.60 |
≤0.040 |
≤0.040 |
0.80-1.10 |
0.15-0.25 |
|
| 4140 |
0.38-0.43 |
0.15-0.35 |
0.75-1.00 |
≤0.040 |
≤0.040 |
0.80-1.10 |
0.15-0.25 |
|
| 45MnMoB |
0.43-0.48 |
0.17-0.37 |
1.05-1.35 |
≤0.020 |
≤0.015 |
|
0.20-0.25 |
0.001-0.005 |
| 1541 |
0.36-0.44 |
- |
1.35-1.65 |
≤0.040 |
≤0.050 |
|
|
|
| 30CrMnSiA |
0.28-0.34 |
0.90-1.20 |
0.80-1.10 |
≤0.020 |
≤0.015 |
0.80-1.10 |
|
|
Mechanical Properties
| Steel Grade |
Deliver Condition |
Tensile Strength
(Mpa)
|
Yield Strength
(Mpa)
|
Elongation
(%)
|
Hardness(HRC) |
| 4130 |
+ SR |
≥813 |
≥690 |
≥15% |
≥24 |
| 4140 |
QT |
≥950 |
≥850 |
≥14% |
28 - 33 |
| 45MnMoB |
+ N |
≥790 |
≥600 |
≥14% |
- |
| 1541 |
+ SR |
≥813 |
≥690 |
≥15% |
≥24 |
| 30CrMnSiA |
QT |
≥850 |
≥750 |
≥14% |
26 - 31 |
Delivery Condition
1.+SR (BKS) — Stress Relief Annealing after Cold Working
2.+N (NBK) — Normalizing
3.QT — Quenching & Tempering
FAQ:
1. Can you provide a sample to check the quality?
We can provide free sample with same or similar sizes for you to check tube quality.
You need to in charge of Express costs.
2. How about your production capacity?
3000 tons/Month.
3. What are your terms of payment?
30%TT in advance, Balance to be paid before shipment.
4. Where is your factory?
Zhangjiagang city, 1.5 hours away from Shanghai.
5. How can I get the quotation A.S.A.P?
Please send us an inquiry with full details as following,quotation will sent to you A.S.A.P:
1). Tube Standard
2). Steel Grade
3). Tube Size and Size Tolerance
4). Tube length
5). Quantity
6). If any special requirements
6. How about the minimum order quantity?
Normally for one size above 1 ton.
Welcome to contact us! Thanks.
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