30CrMnSiA Seamless Steel Oil Well Pipe DIN2391 Standard Drilling Rod Tube for High-Pressure Drilling

30CrMnSiA Grade Drilling Pipe: High Strength, Corrosion Resistance & Weldability for Demanding Oilfield Applications​​

The ​​30CrMnSiA-grade drilling pipe​​ is a ​​premium low-alloy high-strength steel​​ engineered for oilfield operations that demand ​​exceptional strength-to-weight ratio, superior corrosion resistance, and reliable weldability​​. With its optimized chromium (Cr) and manganese (Mn) content, precise heat treatment, and balanced mechanical properties, this grade is ideal for ​​high-pressure environments, corrosive formations, and applications requiring structural integrity under dynamic loads​​.

​​I. Core Advantages of 30CrMnSiA Grade​​

​​1. High Strength with Lightweight Efficiency​​

​​Tensile Strength: ≥850 MPa (minimum)​​ – Delivers ​​robust load-bearing capacity​​ for ​​high-pressure wells (35–50 MPa)​​ and ​​critical structural components​​ (e.g., casing in deep sections), surpassing conventional carbon steels.

​​Yield Strength: ≥750 MPa (minimum)​​ – Ensures minimal deformation under sustained stress, maintaining wellbore stability during ​​prolonged drilling or hydraulic fracturing​​.

​​Lighter Weight than Higher-Alloy Steels (e.g., 4140)​​ – Reduces hoisting loads and operational complexity in ​​deep/extended-reach wells​​ without compromising strength.

​​2. Enhanced Corrosion Resistance​​

​​Chromium (Cr): 0.80–1.10%​​ – Forms a passive oxide layer, improving resistance to ​​mildly corrosive fluids​​ (e.g., brine, CO₂-containing environments) compared to non-alloy carbon steels (e.g., 1541).

​​Manganese (Mn): 0.80–1.10%​​ – Supports hardenability while contributing to ​​general corrosion resistance​​ in variable pH formations.

​​Ideal for Weakly Aggressive Wells​​ – Outperforms standard carbon steels in ​​shallow gas wells, water injection systems, or coastal offshore environments​​ with moderate corrosion risks.

​​3. Superior Weldability & Field Adaptability​​

​​Low Carbon Equivalent (Ceq)​​ – Enables ​​ease of welding​​ (e.g., field joint welding) with ​​minimal preheating or post-weld heat treatment requirements​​, reducing downtime and labor costs.

​​Consistent Microstructure Post-Welding​​ – Maintains mechanical integrity around welded zones, critical for ​​on-site repairs or custom casing connections​​.

​​Adaptable to Complex Geometries​​ – Supports precision threading and bending for ​​directional drilling or horizontal well applications​​.

​​4. Balanced Toughness & Fatigue Resistance​​

​​Elongation: ≥14%​​ – Combines strength with sufficient ductility to absorb ​​dynamic loads​​ (e.g., bit vibration, pressure pulsations) without cracking.

​​Fine-Grained Microstructure (QT Optional)​​ – Enhances ​​impact toughness and fatigue life​​ in cyclic-loading scenarios (e.g., long-term production or thermal cycling wells).

​​5. Cost-Effective Premium Performance​​

​​Lower Alloy Cost than 4140/4130​​ (reduced Cr/Mo content) – Provides ​​high-strength and corrosion resistance at a more economical price point​​ than premium Cr-Mo grades, balancing performance and budget.

​​II. Key Differentiators vs Other Grades​​

​​III. Why Choose 30CrMnSiA-Grade Drilling Pipes?​​

1. Corrosion-Resistant Strength​​ – Outperforms standard carbon steels in ​​mildly aggressive fluids​​ (brine, CO₂), ideal for ​​water injection, coastal, or gas wells​​ with corrosion risks.

2. Weld-Friendly Design​​ – Simplifies ​​field welding and on-site modifications​​ without sacrificing structural integrity, reducing operational costs.

3. High-Strength & Lightweight​​ – Delivers ​​850+ MPa tensile strength​​ with lower weight than 4140, optimizing hoisting efficiency in deep wells.

4. Balanced Cost & Performance​​ – More affordable than 4140/4130 while providing ​​superior corrosion resistance and weldability​​ for mid-range drilling challenges.

​​30CrMnSiA-Grade Drilling Pipes – Engineered for wells where strength, corrosion resistance, and weldability matter.​​

(For extreme high-pressure wells, choose 4140; for budget-first shallow projects, 1541 remains an option. We customize solutions to your specific well conditions.)

Chemical Composition

Mechanical Properties

Delivery Condition​​

1. 1.

   ​​+SR (BKS) — Stress Relief Annealing after Cold Working​

2. 2.

   ​​+N (NBK) — Normalizing​

3. 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.