Name: Carbon seamless steel pipe
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Carbon seamless steel pipe

Carbon seamless steel pipes are manufactured through piercing, hot rolling, or cold drawing processes without any welding seams. Characterized by uniform microstructure, high strength, and superior pressure-bearing capacity, these pipes are widely used for fluid transport and structural applications under high-temperature and high-pressure conditions.

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◉ PRODUCT SPECIFICATION

1. Material Standards & Grades

Primary Standards:

ASTM A106 - Seamless Carbon Steel Pipe for High-Temperature Service
ASTM A53 - Seamless and Welded Steel Pipe
GB/T 8163 - Seamless Steel Tubes for Fluid Transport
EN 10216-1 - Seamless Steel Tubes for Pressure Purposes

Common Material Grades:

Grade	UNS Designation	Equivalent Standards	Key Applications
Grade A	K02501	S235	Low-temperature service
Grade B	K03006	S275	General purpose
Grade C	K03501	S355	High-strength applications
20#	-	1020	Chinese standard general use
STPG 38	-	-	Japanese standard

2. Chemical Composition (% by weight)

Element	ASTM A106 Grade B	GB 20#	EN 10216-1 P235	JIS G3454 STPG 38
Carbon (C)	≤ 0.30	0.17-0.24	≤ 0.16	≤ 0.25
Manganese (Mn)	0.29-1.06	0.35-0.65	0.40-1.20	≤ 0.90
Phosphorus (P)	≤ 0.035	≤ 0.035	≤ 0.025	≤ 0.035
Sulfur (S)	≤ 0.035	≤ 0.035	≤ 0.020	≤ 0.035
Silicon (Si)	≥ 0.10	0.17-0.37	≤ 0.35	0.10-0.35
Chromium (Cr)	≤ 0.40	≤ 0.25	≤ 0.30	-
Copper (Cu)	≤ 0.40	≤ 0.25	≤ 0.30	-

3. Mechanical Properties

Grade	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)	Hardness (HB)
A106 Grade A	≥ 205	≥ 330	≥ 35	≤ 143
A106 Grade B	≥ 240	≥ 415	≥ 30	≤ 163
A106 Grade C	≥ 275	≥ 485	≥ 30	≤ 179
GB 20#	≥ 245	≥ 410	≥ 24	≤ 156
STPG 38	≥ 205	≥ 380	≥ 30	≤ 143

4. Physical Properties

Property	Typical Value	Test Standard
Density	7.85 g/cm³	ASTM E1266
Modulus of Elasticity	190-210 GPa	ASTM E111
Poisson's Ratio	0.27-0.30	-
Thermal Expansion Coefficient	11.2-12.5 × 10⁻⁶/°C	ASTM E228
Thermal Conductivity	45-52 W/m·K	ASTM E1225

5. Product Specifications

Parameter	Standard Range	Tolerance	Available Customization
Outer Diameter	6mm - 914mm	±0.75%	3mm - 1066mm
Wall Thickness	1.0mm - 80mm	+12.5%/-10%	0.5mm - 100mm
Length	3-12.5m	+100mm/-0mm	1-18m
Straightness	≤ 1.5mm/m	-	≤ 0.5mm/m
Ovality	≤ 1.0% of OD	-	≤ 0.5% of OD

6. Manufacturing Processes

Primary Methods:

Hot rolling and piercing
Cold drawing
Extrusion
Pilger rolling

Process Flow:
Billet Preparation → Heating → Piercing → Rolling → Sizing
→ Heat Treatment → Straightening → Cutting → Testing

7. Heat Treatment Options

Treatment Type	Temperature Range	Purpose	Applicable Standards
Normalizing	890-940°C	Grain refinement	ASTM A106
Annealing	850-900°C	Softening	ASTM A53
Stress Relieving	600-650°C	Residual stress removal	ASTM A106
Quenching & Tempering	880-920°C + 550-650°C	High strength	Special requirements

8. Testing & Inspection

Standard Tests:

Hydrostatic test
Ultrasonic test
Eddy current test
Flattening test
Flaring test
Hardness test
Tensile test
Chemical analysis

Optional Tests:

Charpy impact test
Microstructure examination
PMI verification
Third-party inspection
NACE MR0175 for sour service

9. Applications

Primary Applications:

Oil & Gas: Pipeline systems, well casing, tubing
Power Plants: Boiler tubes, superheaters, heat exchangers
Chemical Industry: Reactor piping, process lines
Mechanical Engineering: Hydraulic systems, bearing sleeves
Construction: Structural supports, piling
Automotive: Exhaust systems, chassis components

Service Conditions:

Temperature range: -50°C to 425°C
Pressure rating: Per ASME B31.1/B31.3
Suitable for bending and flanging operations

Quality Assurance:

ISO 9001 Quality Management System
API Monogram (if applicable)
PED 2014/68/EU Compliance
Mill Test Certificate 3.1/3.2 per EN 10204
Complete traceability system

Technical Advantages:

No weld seam, uniform structure
Excellent pressure resistance
Good high-temperature performance
Reliable mechanical properties
Cost-effective for critical applications

All carbon seamless steel pipes are manufactured and tested according to international standards and can be customized to meet specific project requirements.

◉ Surfcae selection

SURFACE	CHARACTERISTIC	SUMMARY OF MANUFACTURING METHOD	APPLICATION
NO.1	Silvery white	Hot rolled to specified thickness	Do not need to have a glossy surface use
NO.1	lackluster	Hot rolled to specified thickness	Do not need to have a glossy surface use
NO.2D	Silvery white	After cold rolling, heat treatment and pickling are carried out	General material, deep material
NO.2B	Gloss is stronger than No.2D	After No.2D treatment, the final light cold rolling is carried out through the polishing roller	The general material
BA	As bright as a sixpence	No standard, but usually a bright annealed surface with high reflectivity.	Building materials, kitchen utensils
NO.3	Rough lapping	Grind with 100~200# (unit) strop tape	Building materials, kitchen utensils
NO.4	Intermediate grinding	Polished surface obtained by grinding with 150~180# strop abrasive tape	Building materials, kitchen utensils
NO.240	Fine lapping	Grinding with 240# strop abrasive tape	kitchenware
NO.320	Very fine grinding	Grinding was carried out with 320# strop abrasive tape	kitchenware
NO.400	The luster is close to BA	Use 400# polishing wheel to grind	General timber, building timber, kitchen appliances
HL	Hairline grinding	Suitable particle material for hair stripe grinding (150~240#) with many grains	Building, construction material
NO.7	It's close to mirror grinding	Use a 600# rotary polishing wheel to grind	For art or decoration
NO.8	Mirror ultrafinish	The mirror is ground with a polishing wheel	Reflector, for decoration