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Q195 Mild Steel Pipe Carbon Steel Tube Manufacturer Round Seamless Carbon Steel Pipe
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Product Brief

Q195 low-carbon steel pipe is a cost-efficient structural piping product compliant with GB/T 700-2006 (Chinese National Standard for Carbon Structural Steel), with mechanical properties and chemical composition optimized for low-carbon applications. It is equivalent to JIS SPHC, DIN ST33, and ASTM A1011 Gr. A, ensuring compatibility with global industrial standards. Its low carbon content and balanced mechanical performance make it ideal for projects requiring high processability and moderate load-bearing capacity.

1. Chemical Composition (Weight %)

Accurate chemical composition is critical to Q195 steel’s performance. The following values comply with GB/T 700-2006:

ElementCarbon (C)Manganese (Mn)Silicon (Si)Sulfur (S)Phosphorus (P)Iron (Fe)
Content Range≤0.120.25-0.50≤0.30≤0.040≤0.040Balanced
Typical Value0.080.380.150.0320.03099.33

2. Mechanical Properties

All mechanical properties are tested in accordance with GB/T 228.1-2021 (Metallic Materials - Tensile Testing) under room temperature (20±5℃):

PropertyTest StandardUnitMinimum ValueTypical Value
Yield Strength (Rel)GB/T 228.1MPa≥195210
Tensile Strength (Rm)GB/T 228.1MPa315-430370
Elongation After Fracture (A)GB/T 228.1%≥3336
Impact Toughness (Akv)GB/T 229J≥27 (at -20℃)32
Hardness (Brinell)GB/T 231.1HBW≤130120

3. Dimensional Specifications & Tolerances

3.1 Outer Diameter (OD) & Wall Thickness (WT)

Tolerances follow GB/T 13793-2016 (Welded Steel Pipes for General Use):

Outer Diameter (OD)Wall Thickness (WT)OD ToleranceWT Tolerance
10 - 30 mm0.8 - 3.0 mm±0.15 mm±10%
31 - 60 mm1.2 - 4.5 mm±0.20 mm±8%
61 - 114 mm1.5 - 6.0 mm±0.25 mm±7%
115 - 219 mm2.0 - 8.0 mm±0.30 mm±6%
220 - 325 mm3.0 - 12.0 mm±0.35 mm±5%

3.2 Length & Straightness

ParameterStandard ValueCustom OptionTolerance
Length6m / 9m / 12m0.5m - 18m (cut-to-length)±5mm/m
Straightness≤1mm/m≤0.5mm/m (high-precision)-

4. Surface Treatment Performance

Surface TreatmentCoating ThicknessCorrosion Resistance (Salt Spray Test)Adhesion (Cross-Cut Test)Service Life (Outdoor)
Hot-Dip Galvanizing60 - 120 μm≥500 hours (no red rust)Grade 0 (no peeling)15 - 20 years
Electroplating (Zinc)8 - 20 μm≥200 hours (no red rust)Grade 1 (minor peeling)5 - 8 years
Epoxy Coating50 - 100 μm≥1000 hours (no rust)Grade 0 (no peeling)20 - 25 years
Black Oxide2 - 5 μm≥50 hours (no rust)Grade 2 (local peeling)2 - 3 years

5. Application-Specific Data

IndustryTypical UsageRequired WT/OD RatioMaximum Working PressureRecommended Surface Treatment
ConstructionScaffolding Tubes1:20 (e.g., 48mm OD × 2.4mm WT)≤0.8 MPaHot-Dip Galvanizing
PlumbingWater Supply Pipes1:15 (e.g., 63mm OD × 4.2mm WT)≤1.0 MPaEpoxy Coating
Mechanical PartsAuto Exhaust Connectors1:25 (e.g., 38mm OD × 1.5mm WT)≤0.3 MPaBlack Oxide
FurnitureFrame Structures1:30 (e.g., 25mm OD × 0.8mm WT)≤0.1 MPaElectroplating
IrrigationAgricultural Pipes1:18 (e.g., 76mm OD × 4.2mm WT)≤0.6 MPaHot-Dip Galvanizing

6. Quality Certification & Test Reports

All Q195 steel pipes are certified by international authorities, with test reports available upon request:

CertificationStandardTest ScopeDocument Type
ISO 9001ISO 9001:2015Quality Management SystemCertificate of Registration
SGSASTM A370 / GB/T 228Mechanical PropertiesTest Report
BVISO 1461Galvanizing Coating QualityInspection Certificate
CEEN 10217-1Welded Pipe Safety for ConstructionCE Declaration of Conformity

7. Order & Logistics Data

Order ParameterValue RangeNotes
MOQ (Standard Sizes)1 ton-
MOQ (Custom Sizes)5 tonsNegotiable for long-term partners
Lead TimeIn-stock: 3-5 workdaysCustom sizes: 10-15 workdays
Packaging Weight50 kg/bundle (OD ≤ 60mm)200 kg/crate (OD > 60mm)
Loading Capacity (20ft Container)25-28 tonsDepends on pipe length and OD
Transportation ModeSea / Rail / RoadDoor-to-door delivery available