FieldEngineersKitEngineering Reference & ASME Code Basis
1. Core Formula & Variable Definitions
ASTM / EN product standards (density reference — screening only) · ASME B36.10M / B36.19M (pipe OD & wall geometry when entered manually)
m = ρ × V · Plate/rect: V = L × W × t · Round bar: V = (π/4) D² L
Pipe/tube: V = (π/4)(OD² − ID²)L with ID = OD − 2t
Catalog densities for SS / Duplex / Nickel alloy procurement screening
This calculator screens piece and total mass from catalog densities for stainless, duplex, nickel alloys, and common comparison metals. SS 316 / 316L density is 8.00 g/cm³ (8,000 kg/m³); SS304 uses 7.93 g/cm³ so the density delta is visible for MTO. SpecRoutes ss316 / ss316l land on those materials. Optional unit price estimates material cost. Mill certificates govern contractual mass.
- ρ (Density) — Catalog mass density (kg/m³). Also shown as g/cm³ and lb/in³.
- V (Volume) — Solid or annular volume from the selected shape dimensions.
- m (Mass) — Piece or total weight (kg / lb) after quantity.
2. Density & mill tolerance notes
Catalog ρ values are for logistics and MTO. Actual mass varies with chemistry and mill wall tolerance.
SS316 is ~0.9% denser — same plate size is slightly heavier.
Scale weight is often 1–3% below theoretical OD×wall mass.
Quick Reference Lookup Table
| Material | kg/m³ | g/cm³ | lb/in³ | Family |
|---|---|---|---|---|
| SS304 / 304L | 7930 | 7.93 | 0.286 | Stainless |
| SS316 / 316L | 8000 | 8.00 | 0.289 | Stainless |
| SS321 | 8020 | 8.02 | 0.290 | Stainless |
| Duplex 2205 (S31803) | 7800 | 7.80 | 0.282 | Duplex |
| Super Duplex 2507 | 7800 | 7.80 | 0.282 | Duplex |
| Inconel 625 | 8440 | 8.44 | 0.305 | Nickel |
| Hastelloy C-276 | 8890 | 8.89 | 0.321 | Nickel |
| Monel 400 | 8830 | 8.83 | 0.319 | Nickel |
| Carbon steel | 7850 | 7.85 | 0.284 | Other |
| Titanium Gr. 2 | 4510 | 4.51 | 0.163 | Other |
Catalog screening densities used by this calculator. Mill chemistry and wall tolerance shift actual piece mass — confirm certificates for contractual shipping weight.
3. Catalog Alloy Groups & Density Screening Limits
Densities are typical annealed / catalog values for MTO and freight screening. Mill certificates govern contractual mass.
| Material Group | Temperature Range | Allowable Stress / Limit | Engineering Notes |
|---|---|---|---|
| SS304 / SS304L (austenitic) | Ambient catalog ρ | ρ = 7.93 g/cm³ | Baseline austenitic grade — ~0.9% lighter than SS316 at the same volume. |
| SS316 / SS316L (austenitic) | Ambient catalog ρ | ρ = 8.00 g/cm³ | Default material in the calculator. Mo addition raises density vs 304/304L. |
| Duplex 2205 / Super Duplex 2507 | Ambient catalog ρ | ρ = 7.80 g/cm³ | Lower density than austenitic 316 but higher strength — do not substitute 316 ρ for duplex MTO. |
| Inconel / Hastelloy / Monel (nickel alloys) | Ambient catalog ρ | ρ ≈ 8.44–8.89 g/cm³ | Among the densest catalog entries — same envelope weighs significantly more than SS304. |
Code Applicability & Safety Boundaries
- Screening tool only — not ASTM A6 / A480 mass tolerances or scale weights
- Optional unit-price output is logistics screening — not a binding quotation
4. Step-by-Step Worked Example
Field VerificationShowHide
Worked example — SS316L plate 2000 × 1000 × 10 mm
Estimate piece mass for one SS316L plate at the calculator default dimensions.
Volume
Mass
Compare SS304
5. How to estimate SS / alloy piece weight
- 1
Select material
Filter or pick SS304/316, Duplex, Inconel, Hastelloy, Titanium, etc.
- 2
Choose shape
Plate, pipe/tube, round bar, rectangular bar, or structural screening.
- 3
Enter dimensions & quantity
Use navbar metric/imperial units. Add optional $/kg or $/lb for cost.
- 4
Read weight & export
Copy or export total mass for MTO / freight. Confirm ρ on the mill cert for PO mass.
6. Frequently Asked Questions & Technical References
ShowHide
This tool uses catalog SS 316 / 316L density = 8.00 g/cm³ (8,000 kg/m³). SS 304 / 304L = 7.93 g/cm³. Open SpecRoute /ss316 or /ss316l for live mass screens.
This tool uses 7.93 g/cm³ for SS304 and 8.00 g/cm³ for SS316/316L — about 0.9% denser for 316 at the same volume.
No. Use this tool for stainless / duplex / nickel alloy density screens and plate/pipe/bar mass. Use Metal Weight & Cost when you need NPS×schedule pipe fill and broader construction metals.
They are catalog screening values. Heat chemistry and product form can shift ρ slightly — use the mill certificate for contractual shipping mass.