ASTM A350 LF2 Blind Flanges NACE MR 0175 ASME B16.5

ASTM A350 LF2 Blind Flanges Manufacturer

As a leading ASTM A350 LF2 blind flanges manufacturer, we specialize in providing low temperature carbon steel flanges designed for use in high-pressure and low-temperature systems. Our ASTM A350 LF2 blind flanges are crafted from low-temperature carbon steel, offering superior strength, durability, and corrosion resistance in critical industrial applications.

What is ASTM A350 LF2 Blind Flange?

ASTM A350 LF2 refers to a specification for low-temperature carbon steel flanges, including blind flanges, designed for use in piping systems that operate in environments with temperatures as low as -50°F to +100°F (-46°C to +38°C). These flanges are widely used in industries such as oil and gas, chemical processing, and petrochemical, where safety, reliability, and performance are paramount.

A blind flange is a type of flange used to close the end of a piping system. It is a flat, round plate with bolt holes for securing the flange to a pipeline. Blind flanges are critical in preventing flow through a pipeline or vessel, ensuring that systems are securely sealed for maintenance, repairs, or during temporary shutdowns.

Key Features of ASTM A350 LF2 Blind Flanges:

• Material Composition: Made from low-temperature carbon steel per ASTM A350 LF2 standards, these flanges provide excellent strength, ductility, and resilience at low temperatures.
• Low-Temperature Performance: Designed specifically for cryogenic temperatures, ASTM A350 LF2 blind flanges can operate efficiently in environments ranging from sub-zero temperatures to moderate heat.
• Corrosion Resistance: The LF2 material is known for its ability to withstand corrosion, making it ideal for use in marine environments, chemical plants, and refineries.
• High Strength: With a tensile strength of 70,000 psi (485 MPa), these flanges can handle high-pressure systems without risk of failure.
• Durability: ASTM A350 LF2 blind flanges are durable and designed for long-term service, reducing the need for frequent replacements.

_{Download the ASTM A350 Latest EDITION PDF}

ASTM A350 LF2 Chemical Composition

	C	Si	Mn	P	S	Cr	Mo	Ni	Al	Sn	Cu
Min		0.15	0.60						0.015
Max	0.22	0.30	1.35	0.02	0.015	0.30	0.12	0.40	0.035	0.01	0.40

ASTM A350 LF2 Blind Flange MECHANICAL PROPERTIES

Tensile	Result
RP 0.2%	36,000 PSI MIN
RM	70,000 – 95,000 PSI
Elongation	22%
Reduction of area	30%
HBW10/3000	Max 187 BHN
KCV @ -46 DEG C	20J min Ave, 16J min single

A350 LF2 Blind Flange Specification

• Dimension : ASME B16.5 / B16.47 A& B.
• Size: ½” to 60” (DN15 to DN1500)
• Pressure ratings: 150# to 2500#
• Impact tested at –46°C (Charpy V-notch)
• NACE MR0175 / ISO 15156 compliance for sour service
• EN 10204 3.1 / 3.2 certificates available

ASTM A350 LF2 Blind Flanges – Heat Treatment

Normalization or Normalization followed by tempering

A typical ITP Inspection and Test Plan for ASTM A350 LF2 Blind Flanges

Stage	Activity	Requirement/Standard	Type of Check	Acceptance Criteria	Inspector	Document Reference
1	Raw Material Verification	ASTM A350 LF2	Certificate Review	Chemical & Mechanical per spec	Manufacturer / QC	Mill Certificate (MTC)
2	Visual Inspection (Raw Material)	Internal Standard	Visual	No defects, cracks, damage	QC	Inspection Report
5	Forging Process	ASTM A350	Process Control Check	As per forging procedure	QC	Forging Log
3	Heat Treatment	As per ASTM A350 / Client Spec	Temperature & Time Log	Normalized / Tempered as required	QC	HT Report
6	Final Machining	ASME B16.5/B16.47	Measurement	Tolerances within limits	QC	Dimensional Report
4	Dimensional Inspection	ASME B16.5 / B16.47 / Drawing	Measurement Tools	As per drawing	QC	Dimensional Report
7	Mechanical Testing	ASTM A350	Tensile, Yield, Elongation	Min. Yield 250 MPa, etc.	Lab / QC	Mechanical Test Report
8	Charpy V-Notch Impact Test	ASTM A350 at –46°C	Destructive Test	Min 27 J avg (3 samples)	Lab / Third Party (if TPI)	Impact Test Report
9	Non-Destructive Testing (Optional)	Client Requirement	UT / MT / PT	As per ASME / Client standard	NDT Level II / TPI	NDT Reports
10	Final Visual and Dimensional Check	ASME B16.5 / Drawing	Visual, Measurement	Surface finish, dimensions OK	QC / Client / TPI	Final Inspection Report
11	Marking & Stamping	ASTM A350 / ASME B16.5	Visual	Proper heat/lot marking	QC	Marking Record
12	Documentation Review & Compilation	Project Requirement	Review	All docs present and signed	QA/QC	Dossier / Data Book
13	Packing & Dispatch Inspection	Client/Project Spec	Visual / Verification	Packing list, labels, protection	QC / Client	Packing List, Dispatch Note

Looking for a reliable manufacturer of ASTM A350 LF2 Blind flanges? We specialize in producing high-quality carbon steel flanges designed for low-temperature service, meeting ASTM A350 LF2 specifications NACE MR 0175 compliance.

Does NACE MR-0175/ISO 15156 specifies the Hardness requirement for ASTM A350 Grade LF2 material?

NACE MR0175/ISO 15156 does not dictate the hardness requirements that may be present in other standards. The standard does define material requirements and use limits as they relate to environmental cracking in the presence of H2S. ASTM A350 LF2 requires the hardness to be 197 HB maximum and this meets the requirements for carbon steel forgings in NACE MR0175/ISO 15156-2. Please refer to Clause A.2.1 and the sub-clauses beneath it for carbon and low alloy steels.

Contact us to receive a Sample MTC for ASTM A350 LF2 Weld neck Flanges.

⬇️Download ASTM A350 LF2 specification

⬇️Download ASTM A350 Standard Latest Edition (PDF)

Download the Dimension of ASME B16.5 Blind Flange