BS 3059 Grade 320 Tubes are carbon steel boiler and heat exchanger tubes made to British Standard BS 3059 for medium pressure and elevated temperature applications. Used in boilers, condensers, heat exchangers, steam lines, refineries, petrochemical plants, power generation equipment and others requiring reliable strength, weldability, dimensional accuracy. The controlled chemistry of carbon, manganese and silicon provides good weldability and formability and service life, and reduced phosphorus and sulphur ensures material quality for pressure and heat-transfer service. USA Piping Solution offers BS 3059 Grade 320 seamless and welded tubes in various sizes, wall thickness and length, along with material test certificates, support during the inspection process and domestic or export ready packaging.
Specifications of BS 3059 Grade 320 Tubes
| Feature | Details |
|---|---|
| Product Name | BS 3059 GR 320 Tubes |
| Category | Seamless Tubes |
| Standards | BS 3059 Part II |
| Steel Grade | Gr. 320 |
| Outside Diameter | 5 - 90 mm |
| Wall Thickness | 0.5 - 15 mm |
| Size Range | 1/2" NB to 36" NB |
| Thickness | 3 - 12 mm |
| Length | Min 3 Meters, Max 18 Meters (or per customer requirement) |
| Schedules | SCH 40, SCH 80, SCH 160, SCH XS, SCH XXS, All Schedules |
| Origin | European, Japanese, Korean, US, Russian, Indian (Strictly No Chinese) |
| Tolerance | Cold drawn pipe: +/- 0.1 mm | Cold rolled pipe: +/- 0.0 mm |
| Craft | Cold rolled and Cold drawn |
| Type | Seamless / ERW / Welded / Fabricated |
| Form | Round, Hydraulic Etc. |
BS 3059 Grade 320 Tubes Chemical Composition
| Element | Carbon (C) | Silicon (Si) | Manganese (Mn) | Phosphorous (P) | Sulphur (S) | Alloy Elements (Mo, Ni, Cr, Cu) |
|---|---|---|---|---|---|---|
| Weight % | max 0.16 | 0.10 - 0.35 | 0.30 - 0.70 | max 0.04 | max 0.04 | Not Specified |
Mechanical Properties of BS 3059 Grade 320 Tubes
| Yield Strength (MPa min) | Tensile Strength (MPa min) | Elongation (A5 min %) |
|---|---|---|
| 195 (approx.) | 320 - 480 | 25% |
Equivalent Grades of BS 3059 Grade 320 Tubes
| Standard Body | Standard / Specification | Grade / Designation |
|---|---|---|
| DIN (German) | DIN 17175 | St 35.8 |
| EN (European) | - | - |
| BS (British) | - | - |
| NFA (French) | NFA A 49-213 | TU 37-c |
| ASTM (USA) | ASTM A369 | Grade FPA |
| ASME (USA) | ASME SA369 | Grade FPA |
Need BS 3059 Grade 320 Tubes for boiler or heat exchanger service? Share your size, OD, wall thickness, quantity and delivery location to receive a price quote with MTC.
Request a QuoteBS 3059 Grade 320 Tubes Tolerance Chart
| Execution | Size Range | OD Tolerance | Wall Tolerance |
|---|---|---|---|
| Hot-rolled Tube | OD - 80 mm OD > 80 mm Wall < 12 mm Wall - 12 mm | +/- 0.4 mm +/- 0.5% of OD | +/- 0.7 mm +/- (5% x wall thickness + 0.1 mm) |
| Hot-rolled peeled tube | All sizes Wall < 12 mm Wall - 12 mm | +0.25 / -0 mm | +/- 0.8 mm +/- (5% x wall thickness + 0.2 mm) |
| Cold Worked tube, cold-rolled or cold-drawn | OD < 40 mm OD 40 - 80 mm OD > 80 mm Wall Thickness < 6 mm Wall Thickness 6 - 8 mm Wall Thickness > 8 mm | +0.30 / -0 mm +0.35 / -0 mm +0.40 / -0 mm | +/- 0.30 mm +/- 0.35 mm +/- 0.40 mm |
Comparison Table of Grade 320 vs Grade 360
| Feature | BS 3059 Grade 320 Tubes | BS 3059 Grade 360 Tubes |
|---|---|---|
| Material Type | Carbon Steel Tube | Carbon Steel Tube |
| Tensile Strength | Moderate strength | Higher strength |
| Yield Strength | Minimum 320 grade strength | Higher yield than Grade 320 |
| Temp. Resistance | Medium-temperature applications | Higher-temperature applications |
| Pressure Handling | Medium-pressure service | High-pressure service |
| Weldability | Good | Excellent |
| Durability | Good durability | Better durability & thermal stability |
| Common Apps | Boilers, condensers, heat exchangers | Superheaters, steam pipelines |
| Industrial Usage | General engineering & processing | Power plants, refineries, petrochemical |
| Cost | More economical | Slightly higher (enhanced properties) |
| Best Selection For | Standard heat applications | Critical high-temp/high-pressure systems |
Application Usage of BS 3059 Grade 320 Tubes
- Chemical Processing
- Heat Exchangers
- Power Generation
- Petrochemical Industry
- Automotive Industry
- Manufacturing and Fabrication
- Oil and Gas Industry
- Industrial Equipment
Frequently Asked Questions
What is BS 3059 Grade 320 used for?
BS 3059 Grade 320 tubes are used in boilers, condensers, heat exchangers, steam systems, power plants, refineries and general engineering applications requiring medium-pressure carbon steel tubing.
Is BS 3059 Grade 320 suitable for boiler tubes?
Yes, BS 3059 Grade 320 is used for boiler and heat exchanger tube applications where the service requirement is moderate strength, weldability and dependable heat-transfer performance.
What is the difference between BS 3059 Grade 320 and Grade 360?
Grade 360 offers higher tensile strength and pressure-handling capability compared with Grade 320. Grade 320 is more suitable for standard boiler, condenser and heat exchanger service, while Grade 360 is selected for more demanding pressure applications.
Do you provide MTC for BS 3059 Grade 320 Tubes?
Yes, USA Piping Solution can supply BS 3059 Grade 320 Tubes with mill test certificates, dimensional inspection reports and third-party inspection support when required.
What details are needed for a BS 3059 Grade 320 tube quote?
Share OD, wall thickness, length, quantity, tube type, end finish, delivery location and certification requirements to receive an accurate quotation.