Carbon Steel Plates & Sheets Supplier in India — A36, A283, A516 & More
Flat steel plates and sheets don’t get talked about as much as pipe, but half the fabrication work in this industry runs through it: base plates, tank shells, structural gussets, whatever needs a flat piece of metal cut to size. Kalpataru Piping is one of the established carbon steel plate suppliers and carbon steel sheet suppliers in India, stocking both as part of our wider carbon steel product range. Our carbon steel plates and carbon steel sheets cover the grades that actually get specified in the field ASTM A36 steel plate for general structural work, A283 and A572 for lighter fabrication, A516 Grade 60/70 when the job’s a pressure vessel or boiler shell.
Thickness runs anywhere from a thin 0.3mm shim sheet up past 120mm plate, hot rolled or cold rolled, in widths up to 3 metres and lengths up to 12. If you’re not sure which grade actually fits your application — and a lot of people aren’t, the specs overlap more than you’d think — our technical team will talk it through with you rather than just quote whatever’s sitting in stock. For a broader read on the material itself, we’ve also put together a short guide on what is carbon steel, worth a look if you’re new to sourcing it. Send us your size, grade, and quantity and we’ll get a number back to you quickly — not a placeholder, an actual quote.
What Are Carbon Steel Plates & Sheets?
Technically it’s the same material, iron and carbon with small amounts of manganese, silicon, sulphur, and phosphorus — the split between “sheet” and “plate” is just thickness. Below roughly 6mm, it’s a sheet; above that, it’s a plate. That distinction matters more than it sounds like it should, because it changes what the material’s used for. Sheet gets formed, bent, pressed — automotive panels, enclosures, ductwork. Plate holds a load — structural framing, tank shells, machine bases. A couple of grades come up again and again:
- ASTM A36: the default structural grade among carbon steel plates. Not glamorous, but the ASTM A36 steel plate welds cleanly and costs less than most alternatives, which is why it’s everywhere on a job site.
- ASTM A283 (Grade A/B/C): a general-purpose plate, a step up in strength selection from A36 without moving into pressure vessel territory.
- ASTM A516 (Grade 60/70): this is the one you specify when the plate is going into a boiler or pressure vessel — it holds up better at low temperature and under repeated stress.
- ASTM A572 (Grade 50): high-strength low-alloy steel, used where you need more strength per unit of weight — bridges, heavier structural work.
If your project also needs round stock, we carry carbon steel round bars in the same grades, and for pressure-piping jobs that pair plate with pipe, our carbon steel pipes covers the tubular side.
Table of Contents
- ASTM A53 Grade B Pipe Supplier in India — Seamless & ERW Carbon Steel Pipes
- What Is ASTM A53 Grade B Pipe?
- ASTM A53 Grade B Pipe Technical Specification
- ASTM A53 B Pipe Chemical Composition (Max %)
- ASTM A53 Grade B Pipe Mechanical Properties
- ASTM A53 B Pipe Size, Schedule & Weight Chart
- ASTM A53 Grade B Pipe Pressure Rating Reference
- ASTM A53 Grade B Pipe Equivalent
- Frequently Asked Questions
Features & Benefits of Carbon Steel Plates & Sheets
A few practical points before you order carbon steel plates or carbon steel sheets from us:
- Thickness from 0.3mm shim stock up to 120mm heavy plate — thin and thick both handled in-house.
- Hot rolled and cold rolled stock, plus boiler-quality (BQ) plate for pressure equipment.
- Widths up to 3000mm, lengths up to 12000mm — custom cut to your drawing if standard sizes don’t fit.
- Surface finishes from mill-scale black through pickled & oiled, 2B, and hairline, depending on the end use.
- Cutting, shearing, and minor fabrication done on-site rather than outsourced.
- Mill TC as standard, third-party inspection through SGS, TUV, or BV when the project needs it.
Plate orders often go out alongside carbon steel flanges and carbon steel buttweld fittings when the job is a full fabrication package rather than just flat stock.
- Specifications
- Grade & Specification Reference
- Mechanical Properties
- Chemical Composition
- Mechanical Properties
- Plate Thickness Guide
- Surface Finishes
Carbon Steel Plates & Sheets Technical Specification
| Parameter | Details |
| Specification | ASTM A36 / ASME SA36, ASTM A283 / ASME SA283, ASTM A516 / ASME SA516, ASTM A572, EN 10025-2, EN 10028-2, IS 2062 |
| Thickness | 0.3mm to 120mm (thin shim through heavy plate) |
| Width | Up to 3000mm |
| Length | Up to 12000mm, custom on request |
| Form | Sheet, Plate, Coil, Strip, Foil, Shim Sheet, Chequered / Floor Plate, Perforated Sheet, Circle / Blank, Cut-to-Size Blank |
| Finish | HR (Hot Rolled), CR (Cold Rolled), Pickled & Oiled, HRPO (Pickled & Oiled), Galvanized, Shot Blasted & Primed, Chequered |
| Condition | As Rolled, Normalized, Quenched & Tempered, Annealed, Stress Relieved |
| Tolerance | As per ASTM / EN / ISO standard tolerance |
| Testing | Chemical Analysis, Mechanical Testing, UT, RT, PMI, Hardness, Impact, Hydro (where applicable) |
| Certification | Mill TC EN 10204 3.1 / 3.2, Third-Party Inspection on request |
Grade & Specification Reference
|
Standard / Grade |
Description |
|
ASTM A36 |
Standard structural steel plate |
|
IS 2062 |
Gr. A / B / E250 / E350 / E450 — Indian structural plate |
|
EN 10025 |
S275JR / S355JR / S355J2 — European structural plates |
|
ASTM A516 Gr. 60/70 |
Pressure vessel and boiler plate |
|
ASTM A283 Gr. C |
General-purpose carbon steel |
|
SAE 1010–1045 |
Low & medium carbon steels |
|
ASTM A572 Gr. 50 |
High-strength low-alloy structural plate |
ASTM A53 Grade B Pipe Mechanical Properties
| Grade | Tensile Strength (min) | Yield Strength (min) |
| Grade A | 48,000 psi (330 MPa) | 30,000 psi (205 MPa) |
| Grade B | 60,000 psi (415 MPa) | 35,000 psi (240 MPa) |
Carbon Steel Plates & Sheets Chemical Composition (Select Grades)
|
Grade |
C |
Mn |
Si |
S Max. |
P Max. |
|
ASTM A36 |
0.25–0.29 |
0.80–1.20 |
0.15–0.40 |
0.05 |
0.04 |
|
ASTM A283 Gr. C |
0.24 max |
0.90 max |
0.40 max |
0.04 |
0.035 |
|
ASTM A516 Gr. 70 |
0.27–0.31 |
0.85–1.20 |
0.15–0.40 |
0.035 |
0.035 |
|
ASTM A572 Gr. 50 |
0.23 max |
1.35 max |
0.40 max |
0.05 |
0.04 |
Carbon Steel Plates & Sheets Mechanical Properties
|
Grade |
Yield Strength (min) |
Tensile Strength |
Elongation (min) |
|---|---|---|---|
|
ASTM A36 |
250 MPa / 36 ksi |
400–550 MPa / 58–80 ksi |
20–21% |
|
ASTM A283 Gr. C |
205 MPa / 30 ksi |
380–515 MPa / 55–75 ksi |
22% |
|
ASTM A516 Gr. 60 |
220 MPa / 32 ksi |
415–550 MPa / 60–80 ksi |
21% |
|
ASTM A516 Gr. 70 |
260 MPa / 38 ksi |
485–620 MPa / 70–90 ksi |
17–21% |
|
ASTM A572 Gr. 50 |
345 MPa / 50 ksi |
450 MPa / 65 ksi min |
18% |
|
IS 2062 E250 |
250 MPa |
410 MPa min |
23% |
|
IS 2062 E350 |
350 MPa |
490 MPa min |
22% |
Plate Thickness Guide
A rough way to think about it, before you get into exact spec numbers:
|
Category |
Thickness Range |
Typical Use |
|
Thin sheet / shim |
0.3mm – 4mm |
Enclosures, ductwork, shim stock, panels |
|
Medium plate |
4mm – 20mm |
General fabrication, machine frames, base plates |
|
Thick plate |
20mm – 60mm |
Structural steelwork, pressure vessels, storage tanks |
|
Extra-thick plate |
60mm+ |
Heavy engineering, mining equipment, ship-building |
Surface Finishes
Carbon steel sheet and plate is supplied in a handful of standard mill finishes. Which one you want depends less on appearance than on what happens to the metal next — whether it gets welded, painted, or left outdoors:
|
Finish |
What It Is |
Typical Application |
|---|---|---|
|
HR (Hot Rolled), mill scale |
As-rolled black surface, loose oxide scale left on |
Structural steelwork, base plates, general fabrication where the surface is painted or blasted later |
|
HRPO (Hot Rolled, Pickled & Oiled) |
Scale removed in acid bath, light oil film applied to stop flash rust |
Weld-ready plate, tank shells, anything going straight to fabrication |
|
CR (Cold Rolled) |
Cold-reduced after pickling — tighter thickness tolerance, smooth matte grey surface |
Enclosures, panels, pressed and formed components |
|
Galvanized (HDG / GI) |
Zinc coated by hot-dip or continuous line |
Outdoor ductwork, roofing, corrosion-exposed sheet metal |
|
Shot Blasted & Primed |
Abrasive blasted to Sa 2.5, shop primer applied |
Structural fabrication, offshore and marine steelwork |
|
Chequered / Floor Plate |
Raised diamond or teardrop pattern rolled into one face |
Walkways, platforms, stair treads, trailer beds |
Where Carbon Steel Plate & Sheet Gets Used
Where this material actually shows up on a project:
- Structural fabrication and civil engineering — base plates, gussets, framing
- Pressure vessels, boilers, and heat exchangers
- Oil & gas platforms and storage tanks
- Ship-building and offshore equipment
- Bridges and high-rise construction
- Mining, cement, and power plant equipment
- Machine frames and heavy equipment beds
On jobs where plate is welded into a pressure boundary, it’s usually specified alongside carbon steel forged fittings and carbon steel fasteners — we can supply all three from the same order.
Carbon Steel Sheet vs Carbon Steel Plate
|
Parameter |
Carbon Steel Sheet |
Carbon Steel Plate |
|
Thickness |
Usually below 6mm |
Usually above 6mm |
|
Typical Use |
Automotive, enclosures, light fabrication |
Heavy engineering, pressure vessels, structural |
|
Forming |
Easier to bend and press |
Higher structural strength, less easily formed |
|
Measured In |
mm or gauge |
mm or inches |
Manufacturing Process & Quality Assurance
Nothing exotic here — the process is standard, and that’s exactly the point. Raw material selection and chemical verification, melting and refining, continuous casting, then hot rolling (and cold rolling where the finish calls for it). Heat treatment follows where the grade needs it, then surface finishing, and a full run of dimensional, mechanical, and chemical testing before anything ships. Ultrasonic testing is done where the application calls for internal soundness checks. Every batch is packed and dispatched only after it clears these checks, and documentation goes out with it — not after. If you want more background on how grades are selected for different applications, our blog has a few relevant write-ups.
Certifications & Documentation
- ISO 9001:2015 Quality Management Certification
- Mill Test Certificate per EN 10204 3.1 / 3.2
- Third-party inspection through SGS, TUV, or Bureau Veritas, on request
- PED and IBR certification available where the application requires it
- Full heat-number traceability on every plate and sheet supplied
You can see the rest of what we stock in our full catalog.
Carbon Steel Plates & Sheets Price List
The price of carbon steel plates and sheets depends on grade, thickness, dimensions, finish and order quantity. Carbon steel plate and sheet pricing moves with HRC billet rates and freight, so any number published here is indicative rather than a quotation. As a working guide, standard structural grades sit at the lower end of the band and boiler-quality plate at the upper end because of the additional testing and normalising involved. The figures below are indicative ex-Mumbai rates as of [MONTH YEAR], exclusive of GST, cutting and freight. Contact us for the latest carbon steel plates and sheets price based on your specifications.
CS Plate Weight Calculator
Use our CS plate weight calculator to quickly estimate the weight of a carbon steel plate based on its length, width and thickness. Enter the required dimensions to calculate the approximate plate weight in kilograms for material planning, costing, transportation and fabrication requirements.
