Carbon Steel Flange

QS Flange: Carbon Steel Flange

Name: Carbon Steel Flange
Material: Carbon Steel
Standard: ANSI B16.5
Size: 1/2 to 24 Inch
Pressure: 150LB to 2500LB
Process Method: Forged
Face: RF/FF
Usage: Used in the Fields of Construction, Chemical Engineering, Petroleum and Natural Gas.

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Carbon Steel Flange – Manufactured in strict compliance with ANSI B16.5 standard, available in sizes from 1/2"to 24"with pressure ratings from 150LB to 2500LB. Produced through ASTM A105 carbon steel forging process, offering both RF (Raised Face) and FF (Flat Face) sealing surfaces. Widely used in industrial piping systems for petroleum, chemical, and power applications. Customization available upon request with specifications and drawings.

All products undergo stringent quality control systems to ensure compliance.

Carbon Steel Flange Quality Control System Technical Specifications

1. Chemical Composition Analysis (Per Heat Verification)

All Carbon Steel Flange raw materials are tested per ASTM A105/A105M-20:

1.1 Test Methods

- Optical Emission Spectrometry (OES)

- Equipment: ARL 3460 Direct Reading Spectrometer (Accuracy ±0.001%)

1.2 Element Control Standards

Element	Standard Range (wt%)	Allowable Deviation	Sampling Requirements
C	≤0.35	±0.02	3 samples/mid-ladle per heat
Mn	0.60-1.05	±0.05	Data archived for 15 years
S	≤0.040	-	Complete spectral records kept

2. Mechanical Properties Testing (ASTM A370-20)

Every batch of Carbon Steel Flange undergoes:

2.1 Sample Preparation

- Orientation: Longitudinal

- Dimensions: φ12.5mm×65mm standard round bar

- Surface finish: Ra≤1.6μm

2.2 Test Items

Test Type	Standard	Equipment Accuracy	Acceptance Criteria
Tensile Test	ASTM E8/E8M	±1% FS	Tensile strength ≥485MPa
Impact Test	ASTM E23	±0.5J	≥27J @ -29℃
Hardness Test	ASTM E10	±1HRB	≤187HB

3. Non-Destructive Testing (100% Implementation)

Carbon Steel Flange Ultrasonic Testing Protocol:

3.1 Test Parameters (ASME SA-388 Class II)

Parameter	Technical Requirement	Equipment Configuration
Probe Type	4MHz Dual-Element Straight Probe	USM Go+ System
Sensitivity Ref.	φ3.2mm FBH DAC Curve	Couplant viscosity≥50cSt
Scanning Speed	≤150mm/s	Auto-recording function

3.2 Defect Evaluation Criteria

- Rejectable defects:

- Individual flaws >φ6mm equivalent diameter

- Any crack indications

- Flaw density >3/cm²

4. Dimensional Inspection (ASME B16.5-2020)

Carbon Steel Flange dimensional control:

4.1 Tolerance Requirements

Inspection Item	Tolerance Range	Measurement Method
Outside Diameter	±1.5mm	CMM 3-cross-section measurement
Bolt Circle	±0.5mm	100% inspection
Face Flatness	0.05mm/100mm	8-point measurement

4.2 Inspection Environment

- Equipment: ZEISS CONTURA G2

- Accuracy: 1.9μm+3μm/m

- Ambient: 20±1℃ controlled

5. Traceability System

Each Carbon Steel Flange features full traceability:

- Unique product ID system

- Raw material heat number tracking

- Heat treatment curves archived (including heating/soaking/cooling rates)

- Test data retained for 15 years (electronic + physical copies)

6. Field Performance Validation

Carbon Steel Flange operational records:

- Oil pipelines: Zero leaks @ 6.4MPa/150℃ for 8 years

- Chemical equipment: Corrosion rate <0.1mm/year in 98% sulfuric acid (lined service)

- Power station valves: Passed 3000 thermal cycles (200℃↔500℃)

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