Steel Fixed Ladders · Factory-Direct Since 2004
Fixed Steel
Ladder
Fixed steel ladder with cage or walk-thru handrails — hot-dip galvanized to ISO 1461, factory-direct with DoC & MTC on every order.
HDG ISO 1461
Rung Diameter
Per-Rung Rating
Standard Heights
Q235B Structural Steel
Fixed Steel Ladder, Built to Spec
A fixed steel ladder with cage or walk thru handrails, made from Q235B structural steel and hot-dip galvanized to ISO 1461. Standard lengths 10–29 ft, fully custom engineering above.
HDG ISO 1461
85–100 μm hot-dip galvanizing for 30+ year exterior life.
Rated to 337 lbf
1.5 kN per rung (≈337 lbf) dual-unit load rating.
Cage from 7–8 ft
Φ700 mm cage (27.6″ ID), OSHA convention start height.
Walk-Thru Handrails
Parapet and platform walk-thru options available.
Steel Specifications
Fixed Steel Ladder Specifications & Dimensions
Standard steel lengths from 10 ft to 29 ft, all load-rated in both kN and lbf. Custom heights engineered to 40 ft.
| Specification | Standard Range | Custom |
|---|---|---|
| Standard Heights | 10 / 12 / 14 / 16 / 18 / 20 / 25 / 29 ft | Up to 40 ft engineered |
| Material | Q235B structural steel | Q355B / per spec |
| Rung Diameter | Φ20 mm (0.79″) | Per spec |
| Rung Spacing | 280 mm / 11″ (≤300 mm) | Per project spec |
| Clear Width | 500 mm (19.7″) | Custom width |
| Load Rating | 1.5 kN ≈ 337 lbf per rung | Engineered |
| Cage | Φ700 mm (≈27.6″ ID), starts 7–8 ft | Custom hoops |
| HDG Coating | 85 – 100 μm (ISO 1461) | Heavier coating |
| Walk-Thru Handrails | Available at top | Per standard |
| Finish | Hot-dip galvanized / painted | Powder coat |
Cage & Walk-Thru
Fixed Steel Ladder With Cage Options & Configurations
Choose the fall-protection layout that fits your roof, parapet, or landing access.
Caged Steel Ladder
Φ700 mm (27.6″ ID) cage with hoops starting 7–8 ft. Meets OSHA cage convention for taller runs.
Walk-Thru Steel Ladder
Walk thru handrails at the top for parapet and platform transitions. Ideal for roof access.
Custom Steel Ladder to Spec
Any height to 40 ft, rest platforms, extension climbs, wall offsets. Engineered and calc-sheeted.
Certifications
Compliance & Documentation
- OSHA 1910.27 — Full Compliance
- ANSI A14.3
- BS 4211:2005+A1:2015
- EN ISO 14122-4
- Cal/OSHA Title 8
Documentation Package
Every steel order ships with the full file — no extra cost, no paywall.
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Declaration of Conformity (DoC)
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Material Test Certificates — EN 10204 3.1
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Structural Calculations
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Welding Procedure Specifications
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HDG certificates per ISO 1461
Factory-Direct Steel Pricing
Factory-Direct Pricing & 24h Quote
Steel priced by weight and process — material, cutting, welding, galvanizing, and crating itemized.
Custom quotation priced by steel weight & process. Industry reference: caged ladders ≈ USD 899–1,099/ton.
Global Shipping & Factory
Steel Ladders to 50+ Countries
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8–12 × 40ft containers shipped per month
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VCI rust protection + ISPM 15 heat-treated wooden crates
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EXW / FOB / CIF terms available
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15–25 business days production lead time
Common questions
Q235B with HDG 85-100 µm, Q345B for heavy-duty loads, and SS304/SS316 stainless - all rated 1.5 kN per rung, Φ20 mm rungs @ 280 mm pitch and 500 mm clear width.
Every batch is checked with a coating thickness gauge to ISO 1461:2022 - minimum 85 µm local, 100 µm average - and an HDG coating report ships with the order.
Yes - standard sections run 10-29 ft and any height is engineered in spliced sections with structural calculations included; single pieces up to 14 m fit our galvanizing bath.
MTC 3.1 mill certificates, Declaration of Conformity, structural calculations, weld inspection records and the HDG coating report - all free with every order.
15-25 working days after drawing approval (10-15 days expedited at +20-30%); ladders are pre-assembled and trial-fitted before shipping.
Structural Steel for Fixed Ladders: Q235B Explained
Beyond grade comparison — what Q235B actually is, how the hot-dip galvanized finish is built layer by layer, and what to verify on the paperwork.
The Grade Name, Decoded
Q235B: What "Q", "235" and "B" Mean
| Q235B per GB/T 700-2006 | What It Means |
|---|---|
| Grade name decoded | "Q" = yield-strength grade, "235" = guaranteed minimum yield strength 235 MPa, "B" = grade B quality — the standard weldable structural grade for ladders. |
| Yield strength | ≥235 MPa (34 ksi) for thicknesses ≤16 mm — the number in the name is a promise, not a label. |
| Tensile strength | 370–500 MPa |
| Carbon content | ≤0.22% (Grade B) — controlled chemistry that welds cleanly with standard MIG/MAG. |
| Charpy impact | ≥27 J @ 20 °C (Grade B) |
| International equivalents | S235JR (EN 10025-2) · SS400 (JIS G3101) · close to ASTM A36 — same family of structural carbon steel. |
| Incoming verification | 100% of stock checked against MTC 3.1 mill certificates — chemistry, mechanicals, dimensions and surface, per GB/T 700 / ASTM A36 / EN 10025. The MTC 3.1 ships with your order. |
Hot-Dip Galvanizing, Step by Step
How the 85–100 µm HDG Finish Is Actually Made
Step 1 · Pickling
Strip to Bare Steel
Hot-rolled steel is cleaned in acid baths that strip mill scale and rust, leaving a bare, active surface ready for the zinc to bond with.
Step 2 · Fluxing
Hold the Surface
A zinc-ammonium chloride flux film keeps the cleaned surface oxide-free in the minutes before dipping — without it, the zinc will not wet the steel.
Step 3 · Galvanizing
Immersion in ~450 °C Zinc
Parts are dipped into molten zinc and a metallurgical zinc-iron alloy layer forms. Our partner's certified bath takes single pieces up to 14 m.
Step 4 · Cooling & Inspection
Measure, Record, Ship
Coating thickness is gauge-checked to ISO 1461:2022 — ≥85 µm local, ≥100 µm average — and the HDG coating report ships with the order.
ISO 1461:2022 Targets
Spec You Can Verify Yourself
- • Local coating ≥85 µm, average ≥100 µm — roughly 700–850 g/m² of zinc.
- • Checked on every batch with a magnetic coating thickness gauge; readings recorded in the HDG report.
- • Service life 40–60 years in rural/industrial atmospheres (ISO 9223 C3–C4), 20–30+ years in coastal air.
- • HDG adds only 2–3 days to production and is the standard finish on every outdoor steel ladder we ship.
HDG vs Paint
Why Galvanizing Beats a Paint System
- • Metallurgical bond — the zinc-iron alloy layers are part of the steel, not a film sitting on it.
- • Sacrificial self-healing — scratches expose zinc, which corrodes first and re-protects the steel.
- • Total coverage — internal tube surfaces, threads and corners that a brush can never reach.
- • Real thickness — 85–100 µm of bonded zinc vs a typical 60–80 µm paint system that fails at every scratch and edge.
Load & Geometry
Performance You Can Engineer With
Rung Load
1.5 kN per Rung
Every rung is engineered for a 1.5 kN (≈337 lbf) point load — the same rating across Q235B, Q345B and stainless builds, backed by structural calculations with every order.
Geometry
Φ20 mm @ 280 mm Pitch
Rungs are Φ20 mm on 280 mm centres with 500 mm clear width; cage Φ700 mm — one consistent geometry across all grades and configurations, easy to spec and inspect.
Heavy-Duty Option
Q345B Upgrade
Need extra margin? Q345B per GB/T 1591 delivers yield ≥345 MPa (50 ksi) for tall caged runs, heavy-traffic access and vibration-prone locations.
Where It Goes
Q235B + HDG Applications
Industrial Plants & Warehouses
Machine platforms, HVAC roofs, pipe racks and mezzanine access — the everyday workhorse of Q235B + HDG.
Standard buildWater & Wastewater Treatment
Tank tops, clarifiers and wet process areas with constant humidity — HDG shrugs off what paint cannot.
HDG 85–100 µmPower & Energy Facilities
Boiler platforms, transformer and turbine access — specify the Q345B option where loads run heavy.
Q345B optionalRoof Access & Plant Rooms
Parapet ladders and roof hatches — the most common fixed ladder duty worldwide, delivered 10–29 ft standard.
Most common dutyMyths, Settled
Common Misconceptions About Galvanized Steel Ladders
Myth
"Galvanized steel rusts, so it needs paint."
Red rust at cut edges is the zinc sacrificial layer finishing its job — cosmetic aging, not structural failure. White rust (zinc oxide from storage moisture) is harmless and self-limiting.
Myth
"Fixed steel ladders must be painted."
HDG to ISO 1461 is the complete finish system — no paint required. Paint is only for color coding (duplex powder over HDG), never as rust protection over galvanizing.
Myth
"All zinc coatings are the same."
Electroplated zinc is 5–15 µm and lasts 2–5 years outdoors; hot-dip galvanizing is 85–100 µm with 40–60 years of service. Same metal, very different coating.
Myth
"Damaged HDG can't be repaired."
Cut edges and drilled holes are zinc-repaired after fabrication, and field scratches are touched up with zinc-rich paint or zinc spray per ASTM A780 — small scratches even self-heal.
Care & Inspection
Three Maintenance Points That Keep the Coating Working
- • Annual visual check: inspect cut edges, drilled holes and weld zones; touch up any damaged coating with zinc-rich paint per ASTM A780.
- • Keep it clean: rinse white rust deposits with water and a soft brush; use mild detergent only — acid or alkaline cleaners attack the zinc layer.
- • Structural re-check: verify rung-to-rail welds and cage fixings every 5 years or after any impact; QC records (MTC, weld, coating) are kept on file for 10+ years.
Steel Grade Selection Guide
Q235B vs SS304 vs SS316: Which Fixed Steel Ladder?
Every Dengtai steel ladder can be built in three grades. Match the grade to your environment, cleaning regime and compliance paperwork — price is only one of four factors.
| Property | Q235B Carbon Steel (HDG) | SS304 | SS316 |
|---|---|---|---|
| Relative Cost | $ (baseline) | $$ ≈ 2.5–3× Q235B | $$$ ≈ 3.5–4× Q235B |
| Yield Strength | ≥235 MPa (34 ksi) | ≥205 MPa (30 ksi) | ≥205 MPa (30 ksi) |
| Corrosion Protection | Hot-dip galvanized, 85–100 µm (ISO 1461) | Inherent — no coating needed | Inherent + 2–3% molybdenum for chloride resistance |
| Outdoor Service Life | 40–60 years with HDG | 50+ years, low maintenance | 50+ years, best in marine/chemical |
| Best Suited For | General industrial, roof access, HVAC, warehousing | Food, pharma, breweries, washdown areas | Marine, coastal, chemical plants, offshore |
| Compliance Paperwork | DoC + structural calculation | DoC + MTC 3.1 + PMI report | DoC + MTC 3.1 + PMI report |
Surface Detail
HDG 85–100 µm, ISO 1461
- • Full hot-dip galvanizing to ISO 1461 — coating thickness 85–100 µm (3.3–3.9 mils), roughly 700–850 g/m² zinc.
- • Covers threads, corners and internal tube surfaces that paint can never reach.
- • Self-healing: scratches expose zinc, which corrodes first and re-protects the steel.
- • Cut edges and drilled holes are zinc-repaired after fabrication, not left bare.
- • Painted or powder-coated finish available on request for indoor or color-coded sites.
When to Upgrade the Grade
SS304 or SS316 Instead of Q235B?
- • SS304: wet washdown, food & beverage, pharmaceuticals — surfaces stay clean and hygienic without coating.
- • SS316: salt air, chlorinated cleaning chemicals, offshore and coastal sites where 304 would pit.
- • Both grades ship with MTC 3.1 mill certificates and 100% PMI check — traceability you cannot get from painted carbon steel.
- • All three grades keep identical geometry, load ratings (1.5 kN ≈ 337 lbf per rung) and OSHA 1910.27 / BS 4211 / EN ISO 14122-4 compliance.
Grade-Specific Questions
Fixed Steel Ladder Material FAQs
When chlorides are present: coastal or offshore sites, chemical plants, or washdown with chlorinated cleaners. SS316's 2–3% molybdenum resists chloride pitting that will eventually attack SS304.
Roughly 40–60 years in rural/industrial atmospheres (ISO 9223 corrosivity C3–C4) and 20–30+ years in coastal air. Heavier coatings are available on request for aggressive sites.
Not recommended — bare or painted carbon steel starts rusting within 5–10 years outdoors. HDG 85–100 µm is the factory standard for every outdoor steel ladder.
Roughly 2.5–4× the material cost, but with zero repainting and a lower lifecycle cost in corrosive or hygienic environments. Send your site details for a grade-specific quote.
Proven in real facilities
Reference projects are shown by industry, country and scale. Client names are available on request with approval.
National utility projects — 15+ countries
23 documented projects, 2021-2025 · 2025
All standardsEnergy & industrial clients — Global
500+ projects since 2004 · 2004-2025
Full compliance docsLargest single order — Malaysia
60 units in one project · 2021
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Walk thru handrails for parapet access
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Full OSHA compliance documentation
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