Structural Steel · Structural
Steel Q235B
Steel Q235B is a structural steel steel — chinese mild-steel sheet. Typical values: 235 MPa yield, 7.85 g/cm³, rated to 400 °C. Available for CNC machining, Sheet metal at FabDigit.
Properties
Typical room-temperature values in the HR (hot Rolled) condition. Metric first, imperial in gray. The bars show where Q235B sits against the other 317 steel grades in the catalog.
Datasheet
| Yield strength | 235 MPa34 ksi |
|---|---|
| Tensile strength | 410 MPa59 ksi |
| Hardness | 125 HB |
| Density | 7.85 g/cm³0.284 lb/in³ |
| Specific strength (yield ÷ density) | 30 |
| Min service temp | -50 °C-58 °F |
| Max service temp | 400 °C752 °F |
| Electrical conductivity | 12 % IACS7 MS/m |
| Machinability | Very good75 / 100 |
| Weldability | Excellent92 / 100 |
| Formability | Excellent92 / 100 |
| ISO 513 machining group | P |
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Against other steel grades
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. Q235B is highlighted; hover a dot for its name, or open the interactive family chart.
Manufacturability
The process limits FabDigit's quote engine applies to Q235B. Design inside these and the part quotes instantly; outside them it routes to an engineer.
CNC machining
| Machinability | Better75 / 100 |
|---|---|
| ISO material group | P.1 |
| Cutting speed (rough / finish) | 220 / 260 m/min |
| Minimum wall | 0.8 mm |
| Minimum internal radius | 1 mm |
| Drill depth limit | 5× diameter |
| Best surface (machined / polished) | Ra 1.6 / — |
| Hardenable after machining | No |
Sheet metal
| Formability | Excellent92 / 100 |
|---|---|
| Weldability | Excellent92 / 100 |
| Bendable | Yes |
Conditions and tempers
How Q235B is supplied and what each state is for. The default is what FabDigit quotes unless your drawing says otherwise.
| Condition | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
HRDefault Hot Rolled (HR) | Cheapest steel, looser tolerance — welded frames, base plates | — | — | — | — |
CR Cold Rolled (CR) | Smoother and more precise than hot rolled — brackets, enclosures | — | — | — | — |
Galvanized Finish State | Outdoor steel without painting — frames, brackets | — | — | — | — |
Heat treatment and post-processing
Operations FabDigit's suppliers routinely run on Q235B, ranked by how often they make sense for this grade.
Heat treatment
| Quench & Temperrecommended | Achieve target hardness with controlled toughness28–55 HRC |
|---|---|
| Full Anneal | Restore ductility; relieve residual stress; coarsen grain |
| Stress Relief | Reduce residual stress without changing structure |
| Normalize | Refine grain; reset prior cold-work |
| Induction Hardening | Local surface hardening via induction50–62 HRC |
| Process Anneal | Reduce stress between cold-work steps |
| Flame Hardening | Local surface hardening via direct flame50–60 HRC |
| Case Harden (Carburize) | Diffuse C into surface; harden case to 60+ HRC58–64 HRC |
Post-processing
| Manual Deburr | Deburrstandard |
|---|---|
| Edge Break (0.5mm) | Deburr |
| Shot Peen | Blast |
| Glass Bead Blast | Blast |
| Laser Mark | Marking |
| CMM Inspection | Inspection |
| FAI Report | Inspection |
| Individual Bag | Packaging |
Surface finishes for Q235B
Coatings and treatments compatible with steel on the processes Q235B runs on. Pick them in the quote configurator or call them out on the drawing.
Plating
- Chrome Plating
- Copper Plating
- Electroless Nickel (EN)
- Gold Plating
- Hard Chrome Plating
- Hot-Dip Galvanizing
- Nickel Plating
- Silver Plating
- Tin Plating
- Zinc Plating
- Zinc-Flake (Dip-Spin) Coating
- Zinc-Nickel Plating
PVD Coating
- AlCrN
- AlTiN
- CrN
- DLC
- MoS2
- TiAlN
- TiB2
- TiCN
- TiN
- WC/C
- ZrN
Organic Coating
- Cerakote
- E-Coating
- Epoxy Coating
- Painting
- Powder Coating
- PTFE Coating
CVD Coating
- CVD Al2O3
- CVD TiCN
- CVD TiN
- Multilayer CVD
Marking / Decoration
- Chemical Etching
- Dot Peen Marking
- Electro-chemical Etching
- Embossing / Debossing
- Ink Stamping
- Laser Marking
- Mechanical Engraving
- Steel Stamping
- Vibro Engraving / Scribing
Black / Phosphate
- Black Oxide
- Manganese Phosphate
- Zinc Phosphate
Thermal Spray
- HVOF Coating
- Plasma Spray
Equivalent designations
Standards and trade names that resolve to Steel Q235B in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Other
- s235_equiv_like
Stock forms
Raw-material forms FabDigit sources Q235B in, with the common sizes held in North American stock.
- Bar diameter
- 圆钢 Ø6圆钢 Ø8圆钢 Ø10圆钢 Ø12圆钢 Ø14圆钢 Ø16圆钢 Ø18圆钢 Ø20圆钢 Ø22圆钢 Ø25圆钢 Ø28圆钢 Ø30圆钢 Ø32圆钢 Ø36+17
- Bar flat
- 扁钢 20×5扁钢 25×4扁钢 30×4扁钢 40×6扁钢 50×5扁钢 60×6扁钢 80×8扁钢 100×12扁钢 120×12扁钢 150×16扁钢 200×20扁钢 250×25扁钢 300×30
- Bar square
- 方钢 6×6方钢 8×8方钢 10×10方钢 12×12方钢 16×16方钢 20×20方钢 25×25方钢 30×30方钢 40×40方钢 50×50方钢 63×63方钢 80×80方钢 100×100方钢 120×120+2
- Tube od
- 钢圆管 Ø18×2钢圆管 Ø20×2钢圆管 Ø25×1.5钢圆管 Ø32×2.5钢圆管 Ø40×2.5钢圆管 Ø48×2钢圆管 Ø57×3钢圆管 Ø60×2钢圆管 Ø76×2.5钢圆管 Ø89×2.5钢圆管 Ø100×2.5钢圆管 Ø108×3钢圆管 Ø114×3钢圆管 Ø133×3+4
- Tube rect_tube
- 矩钢管 40×20×3矩钢管 50×30×4矩钢管 60×40×2矩钢管 80×40×2.5矩钢管 100×50×3矩钢管 120×60×5矩钢管 150×100×4矩钢管 200×100×8矩钢管 250×150×8矩钢管 300×200×4
- Tube sq_tube
- 方钢管 20×20×1.5方钢管 25×25×1.5方钢管 30×30×2.5方钢管 40×40×2.5方钢管 50×50×2方钢管 60×60×3方钢管 70×70×5方钢管 80×80×4方钢管 100×100×5方钢管 120×120×3方钢管 150×150×3方钢管 200×200×4方钢管 250×250×4方钢管 300×300×4
- Structural Shape angle
- 角钢 20×20×3角钢 25×25×4角钢 30×30×3角钢 40×40×3角钢 50×50×5角钢 63×63×6角钢 70×70×6角钢 75×75×8角钢 80×80×8角钢 90×90×10角钢 100×63×6角钢 110×110×10角钢 125×125×10角钢 140×140×10+4
- Structural Shape channel
- 槽钢 50×37×4.5槽钢 63×40×4.8槽钢 80×43×5槽钢 100×48×5.3槽钢 126×53×5.5槽钢 140×58×6槽钢 160×63×6.5槽钢 180×68×7槽钢 200×73×7槽钢 220×77×7槽钢 250×78×7槽钢 280×82×7.5槽钢 300×85×7.5
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.