At Sandvik, quality is not just a requirement—it’s the foundation of everything we do. Our commitment to quality drives us to manufacture and supply Pipes & Tubes, Pipe Fittings, and Flanges that meet and exceed international standards such as ASTM, ASME, DIN, and EN. We follow strict quality control procedures at every stage—from raw material inspection to final dispatch—ensuring that every product delivers superior performance, dimensional accuracy, and long service life.
We continuously improve our processes through innovation, technology, and customer feedback. Our quality management system is aligned with global best practices, ensuring full traceability, third-party inspections, and adherence to project-specific technical requirements.
Sandvik is dedicated to delivering defect-free products, on time, every time—backed by technical expertise, certified processes, and a customer-focused mindset.
Quality assurance plan for Seamless Carbon Steel & Alloy Steel Straight Tubes / Pipes
| SANDVIK (AN ISO 9001:2000 CERTIFIED COMPANY) | |||||||
|---|---|---|---|---|---|---|---|
| Sr. No | Operation | Characteristics | Type/Method of Check | Ref STD. | Instrument used | Testing arrived used | Extend of check % |
| 1. RAW MATERIAL | |||||||
| 1.1 | Seamless Mother Hollows | ||||||
| [A] Dimension | Dimensional Measurement ( OD, THK ) | As per Application STD. | Micrometer OD & THK | SANDVIK | As per Q.S.P | ||
| [B] Surface | Visual Inspection | – | Visual | SANDVIK | Random Checking | ||
| [C] Chemical Checking | Chemical check analysis | As per Std. & P.O. Req. | Spectrometer | At out side NABL approved Lab. | 01 Sample from each heat lot. | ||
| [D] Mechanical Testing | Tensile Testing (Yield st., U.T.S. & % EL.) | As per approved STD. | U.T.M machine | SANDVIK | On Each lot basis as per QSP | ||
| [E] Color Coding | – | Color code chart | – | – | – | ||
| 2. IN PROCESS CONTROL | |||||||
| 2.1 | Intermediate 100% Prod. & Q.C Dept. Heat Treatment | ||||||
| [A] Temperature | Temp.Monitoring | As per Std. & PO Req. | Automatic Temp.Controller | SANDVIK | 100% | ||
| [B] Speed & Feed Qty | AC Variable Drive | Automatic Temp.Controller | SANDVIK | Speed & feed checking for maintaining soaking time (Depends on OD & THK of the tube ) | |||
| 2.2 | Intermediate Pickling | % of HCL,% of Fe. | Titration method | – | Chemical Testing Lab by Titration | SANDVIK | Random Check |
| 2.3 | Coating | Acidity of Phosphating both Fe% | – | – | Lab. | SANDVIK | Randomly Check from Each lot |
| 2.4 | Drawing | ||||||
| [A] Dimensions | Dimensional Measurement ( OD, Thk, Length ) | As per Std. & P.O Req. | Micrometer OD, Thk & Measuring tape | SANDVIK | Random Dimensions ( OD, Thk, Length ) As per Application Std. & PO Req. | ||
| [B] Surface | Visual Inspection | Visual | SANDVIK | Random Checking | |||
| 2.5 | Soap Bath | % of Fatly Acid | – | – | Chemical Testing Lab. | SANDVIK | Random Check |
| 2.6 | Heat Treatment | ||||||
| [A] Temperature | Temp. Monitoring | As per Appro. Std. & P.O Req. | Automatic Temp. Controller | SANDVIK | 100% | ||
| [B] Speed & Feed | Depends on Tubes OD & Thk | A.C. variable Drive | SANDVIK | Speed & feed checking for maintaining socking time ( Depends on OD, THK, of the tube ) | |||
| [C] Mechanical Testing | Tensile Testing / Hardness Checking | As per Appro. Std. & P.O Req. | U.T.M. Machine / Rockwell superficial hardness tester & Rockwell hardness Tester | SANDVIK | U.T.M. Machine / Rockwell superficial hardness tester | ||
| 2.7 | Pickling | HCL % & Fe % | – | – | Lab. | SANDVIK | 100% on each lot |
| 2.8 | Straightening | ||||||
| [A] Dimensions | Dimensional Measurement ( OD, Thk, Length ) | As per Std. & P.O Req. | Micrometer OD, Thk & Measuring tape | SANDVIK | Random Dimensions ( OD, Thk, Length ). | ||
| [B] Surface | Visual Inspection | – | – | SANDVIK | Random Checking | ||
| 2.9 | End Cutting | Length Checking | Length check by measuring tape | As per P.O Req | Lab. | SANDVIK | Random Checking |
| 2.10 | Hydro Testing | Pressure Testing by keeping of pressure for minimum of 5 seconds. | Hydrostatic test | As per Std. & P.O Req. | Hydrostatic test Bench | SANDVIK | 100% |
| 2.11 | Eddy Current( If applicable) | Surface & sub surface condition | E.T Method(Non Destructive test) | ASTM –A 450/ E-309 | Off line eddy current testing machine | SANDVIK | 100% |
| 2.12 | Mechanical Testing for Mechanical Properties | ||||||
| [A] Tensile | U.T.S., Yield ST & % El | As per Std. & P.O Req. | U.T.M M/C | SANDVIK | Random Tensile test carried out As per Std. applicable | ||
| [B] Hardness Testing | Hardness testing | As per Std. & P.O Req. | Rockwell superficial, Rockwell Hardness Tester | SANDVIK | Randomn Check as per applicable Std. | ||
| [C] Flaring, Flatting bend testing | – | As per Std. & P.O Req. | – | SANDVIK | Randomn Check as per applicable Std. | ||
| [D] Impact Testing | – | As per Std. & P.O Req. | Impact Testing Machine | Out side NABL approved Lab | Randomn Check as per applicable Std.Req. | ||
| 2.13 | Ultrasonic Testing( If applicable) | Sub surface condition | Non Destructive testing by U.T. method | ASTM –E 213& P.O Req | Ultrasonic testing machine | Outside | 100% |
| 2.14 | Chemical Testing | ||||||
| Product analysis | Chemical check analysis | As per Std. & P.O Req. | Spectrometer | Outside NABL approve Lab. | Random testing as per app. STD Req. | ||
| P.M.I machine | Spectrometer | SANDVIK | 100% | ||||
| 2.14 | Final Cutting | Length | length measurement by measuring tape | As per Std. & P.O Req. | Measuring Tape | SANDVIK | Random check as per application standard Req. |
| 3. FINAL INSPECTION | |||||||
| 3.1 | Visual Dimensional | ||||||
| [A] Dimensions | Dimensional Measurement (OD, Thk, Length ) | As per app. Std. | Micrometer OD, Thk & measuring tape | SANDVIK | 100% | ||
| [B] Visual ( Surface ) | Straightens,End cuts surface checking | – | – | SANDVIK | 100% | ||
| 3.2 | Identification | Product marking | Stenciling & testing | As per app. Std. | Marking M/C,marking slates | SANDVIK | 100% |
| 4. PACKING | |||||||
| 4.1 | Packing | Product delivery condition | Visual | – | – | SANDVIK | 100% |
| 5. DOCUMENTATION | |||||||
| 5.1 | Final documents | Compliance to quality system procedure, P.O. Req. & appli. TDC Req. | Verification and Review | As per quality system procedure & PO Req. (Material Test certi.) | – | SANDVIK | 100% |