When dealing with industrial piping systems, precision and efficiency are non-negotiable. Whether you’re in the process of selecting materials or assembling components, understanding the steel density conversion and weld neck flange dimensions is essential. This article covers everything you need to know about Steel Density Conversion Calculator LB IN3/ KG M3/ LB FT3 and the differences between Weld Neck Flange Class 150 and 300 Dimensions to support your next steel piping project.
Steel Density Conversion Calculator LB IN3/ KG M3/ LB FT3
What is Steel Density?
Steel density refers to the mass of steel per unit volume. It’s commonly measured in various units depending on the industry or region. The three most used units are:
- Pounds per cubic inch (LB/IN³)
- Kilograms per cubic meter (KG/M³)
- Pounds per cubic foot (LB/FT³)
Understanding how to convert between these units is critical when working with international specifications, exporting steel pipes, or sourcing raw material with varying density requirements.
Why Use a Steel Density Conversion Calculator?
Manual conversion between LB IN3, KG M3, and LB FT3 can be complex and prone to error. This is where the Steel Density Conversion Calculator becomes an essential tool. It allows engineers, procurement specialists, and manufacturers to:
- Ensure accurate weight calculations for shipping
- Meet industry-specific material standards
- Optimize designs for structural and mechanical performance
Steel Density Conversion Formulas
To understand the calculator better, here are the basic formulas used for steel density conversion:
- 1 LB/IN³ = 27,680 KG/M³
- 1 LB/FT³ = 16.0185 KG/M³
- 1 KG/M³ = 0.0000361273 LB/IN³
Using these formulas, the steel density can be accurately converted across different measurement systems.
For example, the density of carbon steel is approximately 7.85 g/cm³, which converts to:
- 0.284 LB/IN³
- 7850 KG/M³
- 490 LB/FT³
At Tianjin United Steel Piping Co., Ltd, we offer high-precision steel pipes that comply with global weight and density standards, making them suitable for all types of industrial and construction applications.
Weld Neck Flange Class 150 and 300 Dimensions
What is a Weld Neck Flange?
A weld neck flange is a type of pipe flange that is welded to a pipe by means of a neck. It is specifically designed to transfer stress to the pipe, reducing high-stress concentrations at the base of the flange. This makes it ideal for high-pressure and high-temperature environments.
These flanges are widely used in:
- Petrochemical and chemical plants
- Offshore and onshore oil and gas projects
- Power plants and high-pressure processing units
Class Ratings – What Do They Mean?
Flanges are classified into pressure classes defined by the American National Standards Institute (ANSI). The most common among these are:
- Class 150
- Class 300
Each class represents a pressure-temperature rating. Class 300 flanges can handle higher pressures and temperatures than Class 150 flanges, making the correct selection crucial to system integrity.
Weld Neck Flange Class 150 Dimensions
Weld Neck Flange Class 150 dimensions vary depending on the nominal pipe size (NPS). Here are a few standard sizes:
| NPS | Outside Diameter (OD) | Bolt Circle Diameter | Number of Bolts | Flange Thickness |
| 2″ | 6″ (152mm) | 4.75″ (121mm) | 4 | 0.69″ (17.5mm) |
| 4″ | 9″ (229mm) | 7.5″ (191mm) | 8 | 0.94″ (24mm) |
| 6″ | 11″ (279mm) | 9.5″ (241mm) | 8 | 1.06″ (27mm) |
Weld Neck Flange Class 300 Dimensions
Compared to Class 150, Class 300 flanges have thicker bodies and larger bolt circles for better pressure containment. Here’s a sample:
| NPS | Outside Diameter (OD) | Bolt Circle Diameter | Number of Bolts | Flange Thickness |
| 2″ | 6.5″ (165mm) | 5.5″ (140mm) | 8 | 0.88″ (22mm) |
| 4″ | 10.5″ (267mm) | 7.88″ (200mm) | 8 | 1.12″ (28.5mm) |
| 6″ | 13″ (330mm) | 11″ (279mm) | 12 | 1.38″ (35mm) |
Choosing Between Class 150 and Class 300
When selecting a flange class, consider the working pressure, temperature, and fluid type.
- Choose Class 150 for low-pressure water lines or ambient temperature air systems.
- Opt for Class 300 in high-pressure steam or hydraulic systems.
At TUSPIPE, we manufacture and supply high-quality weld neck flanges in both Class 150 and 300, adhering to international ANSI, ASME, and API standards. Our flanges are suitable for seamless integration with ERW and seamless pipe systems.
Why Choose Tianjin United Steel Piping Co., Ltd?
At TUSPIPE, we are proud to be a leading ERW pipe manufacturer in China, offering a wide range of steel pipes and pipe fittings to meet diverse industrial needs. Here’s what sets us apart:
- Precise Steel Density Calculations: Our products come with detailed steel density data in LB IN³, KG M³, and LB FT³ to support global engineering needs.
- Standardized Flange Dimensions: All our weld neck flanges follow standardized Class 150 and Class 300 dimensions to ensure global compatibility.
- Quality and Certification: ISO-certified manufacturing with strict quality checks to meet ASTM, API, and EN standards.
- Global Reach: Serving clients across Asia, Europe, the Americas, and the Middle East.
Final Thoughts
Understanding steel density conversion and selecting the correct weld neck flange dimensions is crucial for the success of your industrial piping projects. By using a Steel Density Conversion Calculator LB IN3/ KG M3/ LB FT3, you ensure accurate material measurement. At the same time, choosing between Weld Neck Flange Class 150 and 300 Dimensions ensures your system performs safely under pressure.
For precise, high-quality piping components, contact Tianjin United Steel Piping Co., Ltd — your trusted partner in industrial piping solutions.
Related Products
- ERW Steel Pipes
- Seamless Pipes
- Weld Neck Flanges (Class 150 & 300)
- Pipe Fittings and Couplings
- ASTM A53, A106, API 5L Products