YB/T 4202 48.3 mm Hot-Dip Galvanized Carbon Steel Scaffolding Pipe in Q235-Q345B Grades
Basic Properties
Place of Origin:
ZheJiang/China
Brand Name:
TORICH
Certification:
ISO9001 ISO14001 TS16949
Model Number:
YB/T 4202
Trading Properties
Minimum Order Quantity:
1Ton
Price:
Negotiable
Payment Terms:
L/C,D/A,D/P,T/T,Western Union,MoneyGram
Supply Ability:
60000 Ton/Tons per Year
Product Summary
YB/T 4202 Small-diameter Galvanized Carbon Steel Pipe For Scaffolding YB/T 4202 galvanized carbon steel scaffolding pipe is a round, longitudinally welded structural tube manufactured for temporary access platforms, working scaffolds and supporting frames used in construction. The pipe is normally ...
Product Details
Highlight:
Straight Seam Welded Pipes Q195
,Bright Large Diameter Welded Steel Pipes
,Scaffolding Welded Steel Tube
Product:
Galvanized Welded Carbon Steel Scaffolding Pipe
Manufacturing Process:
High-frequency ERW, Longitudinal Seam Welded
Material:
Carbon Structural Steel Or Low-alloy High-strength Structural Steel
Principal Standard:
YB/T 4202-2009
Common Grades:
Q235A, Q235B, Q275A, Q275B And Q345B
Outside Diameter:
Standard Scaffolding Size: 48.3 Mm
Common Wall Thickness:
2.30, 3.25, 3.50, 3.75 And 4.00 Mm, Subject To Grade And Design
Custom Length:
1–12 M By Agreement
Product Description
YB/T 4202 Small-diameter Galvanized Carbon Steel Pipe For Scaffolding
YB/T 4202 galvanized carbon steel scaffolding pipe is a round, longitudinally welded structural tube manufactured for temporary access platforms, working scaffolds and supporting frames used in construction.
The pipe is normally produced by high-frequency electric resistance welding from carbon or low-alloy structural steel strip. A controlled outside diameter, wall thickness and straightness are necessary to maintain reliable engagement with scaffold couplers, clamps and connecting components.
The standard scaffolding diameter is 48.3 mm. Depending on the selected steel grade and structural design, common wall thicknesses include 2.30 mm, 3.25 mm, 3.50 mm, 3.75 mm and 4.00 mm. Hot-dip galvanizing may be applied after welding to provide corrosion protection for outdoor storage, repeated assembly and exposure to humid construction environments.
YB/T 4202-2009 is a legacy Chinese industry standard. For new projects, the purchaser should state the required edition, local scaffolding code, dimensional specification, coating requirement and inspection criteria in the purchase order.
Specifications
| Parameter | Available Specification |
|---|---|
| Product | Galvanized welded carbon steel scaffolding pipe |
| Manufacturing Process | High-frequency ERW, longitudinal seam welded |
| Material | Carbon structural steel or low-alloy high-strength structural steel |
| Principal Standard | YB/T 4202-2009 |
| Reference Material Standards | GB/T 700 and GB/T 1591 |
| Common Grades | Q235A, Q235B, Q275A, Q275B and Q345B |
| Outside Diameter | Standard scaffolding size: 48.3 mm |
| Common Wall Thickness | 2.30, 3.25, 3.50, 3.75 and 4.00 mm, subject to grade and design |
| Standard Length | 4,000-8,000 mm under the legacy specification |
| Custom Length | 1-12 m by agreement |
| Outside-Diameter Tolerance | Typically ±0.30 mm for YB/T 4202 scaffolding tube |
| Wall-Thickness Tolerance | Typically ±0.15 mm for YB/T 4202 scaffolding tube |
| Fixed-Length Tolerance | As specified in the purchase order |
| Straightness | Controlled for full-length coupling and scaffold assembly; tighter project tolerance available |
| Cross-Section | Round |
| End Condition | Plain cut, deburred or project-specific end preparation |
| Surface Condition | Hot-dip galvanized, pre-galvanized, black or painted |
| Zinc Coating | Specified by coating mass or local thickness in the purchase order |
| Weld Condition | Longitudinal ERW seam with controlled internal and external weld profile |
| Heat Treatment | Normally supplied as-welded; weld-seam treatment may be specified |
| Inspection | Chemical analysis, tensile test, flattening test and dimensional inspection |
| Documentation | Mill Test Certificate, dimensional report and coating report when ordered |
Main Characteristics
1. Controlled 48.3 mm Coupler Interface
The 48.3 mm outside diameter is compatible with widely used scaffold couplers designed around the international 48.3 mm tube system. Maintaining a narrow diameter tolerance helps achieve consistent clamp contact and reduces the risk of localized slippage caused by oversized or undersized tubes.
2. Grade-Specific Wall Thickness
The wall thickness is selected according to steel strength and scaffold design rather than treated as a purely commercial weight category.
| Steel Grade Group | Typical Applicable Wall Thickness |
|---|---|
| Q235 grades | 3.50, 3.75 or 4.00 mm |
| Q275 and Q295 grades | 3.25, 3.50, 3.75 or 4.00 mm |
| Q345 grades | 2.30, 3.25, 3.50, 3.75 or 4.00 mm |
Final selection must be verified against the scaffold engineering calculation, applicable safety code and minimum measured wall thickness.
3. Predictable Unit Weight
Typical theoretical weights for 48.3 mm outside-diameter tubes are:
| Outside Diameter | Wall Thickness | Approximate Theoretical Weight |
|---|---|---|
| 48.3 mm | 2.30 mm | 2.61 kg/m |
| 48.3 mm | 3.25 mm | 3.61 kg/m |
| 48.3 mm | 3.50 mm | 3.87 kg/m |
| 48.3 mm | 3.75 mm | 4.12 kg/m |
| 48.3 mm | 4.00 mm | 4.37 kg/m |
Theoretical weight is used for commercial calculation. Actual shipment weight may vary within the permitted dimensional and mass tolerances.
4. Structural Weld Performance
The longitudinal seam is produced by high-frequency resistance welding with controlled heat input, forming pressure and line speed. The tube is suitable for flattening inspection to evaluate weld soundness and the ability of the pipe wall to deform without premature weld separation.
5. Galvanized Corrosion Protection
Hot-dip galvanizing creates a metallurgically bonded zinc coating on the external and internal surfaces. The required zinc mass, coating thickness, surface appearance and repair criteria should be specified separately because the required corrosion class depends on project exposure and service duration.
6. Defined Strength Levels
The available grades provide nominal minimum yield strengths from 235 MPa to 345 MPa. This allows the project engineer to balance tube mass, wall thickness, handling requirements and structural capacity.
Our Technical Advantages
1. How Is Coupler Fit Controlled?
A scaffolding tube may satisfy the nominal 48.3 mm designation while still causing assembly problems if the actual diameter, ovality or zinc buildup is uncontrolled.
Our dimensional control includes:
- Outside-diameter measurement at multiple circumferential positions
- Ovality verification at both pipe ends and along the tube body
- Wall-thickness measurement away from and adjacent to the weld
- Post-galvanizing dimensional verification
- Trial assembly with the specified scaffold coupler when required
The inspection report can state actual measured diameter and wall thickness rather than only nominal values.
2. How Is Under-Thickness Prevented?
Scaffolding capacity is sensitive to the actual remaining wall thickness. Nominal thickness alone is insufficient when negative rolling tolerance, weld profiling or zinc preparation reduces the steel section.
Our control method includes:
- Incoming strip-thickness inspection
- Continuous or scheduled ultrasonic wall-thickness measurement
- Minimum-wall verification instead of average-wall reporting
- Separate measurement at the weld zone
- Batch traceability from steel coil to finished bundle
A minimum measured wall-thickness requirement can be written into the order specification.
3. How Is Galvanizing Quality Verified?
Coating durability depends on surface preparation, bath control, drainage and coating continuity. A visually bright surface does not by itself demonstrate sufficient zinc protection.
Available verification includes:
- Zinc-coating mass test
- Magnetic coating-thickness measurement
- Visual inspection for bare spots, excessive runs and sharp zinc projections
- Adhesion assessment
- Internal coating inspection
- Repair-area control
- Coating report linked to the production batch
The purchaser should specify whether acceptance is based on average coating mass, minimum local thickness or both.
Execution Standards
| Standard System | Relevant Standard | Application |
|---|---|---|
| China YB | YB/T 4202-2009 | Welded steel pipes for construction scaffolding; legacy specification |
| China GB | GB/T 700 | Carbon structural steel grades such as Q235 and Q275 |
| China GB | GB/T 1591 | Low-alloy high-strength structural steel grades |
| China GB | GB/T 13793 | Longitudinal electric-resistance-welded steel tubes |
| China GB | GB/T 3091 | Welded steel pipe for low-pressure fluid service, sometimes referenced for scaffold tube supply |
| China JGJ | JGJ 130 | Technical safety requirements for coupler-type steel-tube scaffolding |
| ASTM | ASTM A500/A500M | Cold-formed welded and seamless carbon steel structural tubing |
| ASTM | ASTM A53/A53M | Black and hot-dip galvanized welded and seamless steel pipe |
| European | EN 39 | Loose steel tubes for tube-and-coupler scaffolds |
| European | EN 10219 | Cold-formed welded structural hollow sections |
| British/European | BS EN 10255 | Non-alloy steel tubes suitable for welding and threading |
| Japanese | JIS G 3444 | Carbon steel tubes for general structural purposes |
| Japanese | JIS A 8951 | Tubular steel scaffolds |
| Russian | GOST 10704 | Longitudinal electric-welded steel tubes, dimensions |
| Russian | GOST 10705 | Technical requirements for longitudinal electric-welded steel tubes |
Application
Tube-and-Coupler Facade Scaffolding
The pipe is used as the vertical standards, horizontal ledgers and diagonal braces of tube-and-coupler facade scaffolding erected around commercial and residential buildings.
For this application, the tube is cut to project lengths and connected by right-angle, swivel or sleeve couplers. The scaffold design must specify tube grade, actual wall thickness, spacing, bracing arrangement, foundation conditions, working load and maximum erection height.
Chemical Composition
| Grade | C Max. | Si Max. | Mn | P Max. | S Max. | Additional Alloy Limits |
|---|---|---|---|---|---|---|
| Q235A | 0.22 | 0.35 | 0.30-0.65 | 0.045 | 0.050 | Residual elements controlled by GB/T 700 |
| Q235B | 0.20 | 0.35 | 0.30-0.70 | 0.045 | 0.045 | Residual elements controlled by GB/T 700 |
| Q275A | 0.24 | 0.35 | 0.50-0.80 | 0.045 | 0.050 | Residual elements controlled by GB/T 700 |
| Q275B | 0.21 | 0.35 | 0.50-0.80 | 0.045 | 0.045 | Residual elements controlled by GB/T 700 |
| Q345B | 0.20 | 0.50 | 1.70 max. | 0.035 | 0.035 | Nb ≤0.07, V ≤0.15, Ti ≤0.20; other alloy limits according to GB/T 1591 |
Mechanical Properties
| Grade | Minimum Yield Strength | Tensile Strength | Minimum Elongation | Impact Requirement |
|---|---|---|---|---|
| Q235A | 235 MPa | 370-500 MPa | 26% | Normally not mandatory for Grade A |
| Q235B | 235 MPa | 370-500 MPa | 26% | Grade B quality requirement according to GB/T 700 |
| Q275A | 275 MPa | 410-540 MPa | 22% | Normally not mandatory for Grade A |
| Q275B | 275 MPa | 410-540 MPa | 22% | Grade B quality requirement according to GB/T 700 |
| Q345B | 345 MPa | 470-630 MPa | 21% | Charpy V-notch requirement according to the specified GB/T 1591 edition |
Frequently Asked Questions
Q: Are you trading company or manufacturer?
A: manufacturer, also can do trading.
Q: How long is your delivery time?
A: Generally speaking, it is 10-15 days if the goods are in stock, or it is 30-40 days if the goods are not in stock, it is according to quantity.
Q: Do you provide samples? is it free or extra?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment?
A: Payment <= 2000 USD, 100% in advance. Payment >= 2000 USD, 30% T/T in advance, balance before shipment. If you have another question, please feel free to contact with me.
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