How to type the symbol for secondary steel
In the fields of construction engineering and materials science, secondary steel is a common steel type, and its symbol input method is often searched by users. This article will combine the hot topics on the Internet in the past 10 days to explain how to enter the secondary steel symbol and provide structured data of relevant hot content.
Input method of first and second grade steel symbols
The symbol for secondary steel is usually expressed as "Φ"Add the steel bar diameter value (for example, Φ12). The following are input methods in different scenarios:
| Platform/Software | Input method |
|---|---|
| Windows system | Alt+934 (keyboard input) or caret to select Φ in "Greek Letters" |
| Mac system | Option+F or search in character viewer |
| Word document | [Insert]-[Symbol]-[Basic Greek] |
| mobile phone input method | Search for "diameter symbol" in the symbol library or long press the letter O to select Φ |
2. Data related to recent hot topics
According to the search data of the entire network, the hot content related to "steel symbol" in the past 10 days is as follows:
| Ranking | hot topics | Search volume trends |
|---|---|---|
| 1 | Symbol changes in the new 2024 steel bar specification | ↑320% |
| 2 | CAD special symbol input skills | ↑185% |
| 3 | Comparison of properties of third-grade steel and second-grade steel | ↑150% |
| 4 | Interpretation of new national standards for steel structure design | ↑92% |
Comparison of technical parameters of third-level steel
Technical standard data of the current mainstream secondary steel in the market (GB/T 1499.2-2018):
| parameters | HPB300 (Level 1) | HRB335 (Level 2) | HRB400 (Level 3) |
|---|---|---|---|
| Yield strength | ≥300MPa | ≥335MPa | ≥400MPa |
| tensile strength | ≥420MPa | ≥455MPa | ≥540MPa |
| Elongation | ≥25% | ≥17% | ≥16% |
| Symbol example | φ6 | Φ12 | Φ18 |
4. Frequently Asked Questions
Q1: Why is my Φ symbol displayed as garbled characters?
Answer: You need to ensure that the document encoding is set to UTF-8, or use a font that supports Greek letters such as Song Dynasty.
Q2: How to mark secondary steel symbols in CAD?
Answer: It is recommended to use %%C shortcut input (for example, %%C12 means Φ12), or set special characters through [Text Style].
Q3: How to send steel bar symbols in mobile WeChat chat?
Answer: You can copy the Φ symbol in this article for later use, or use the "Symbol Collection" - "Mathematical Symbols" function of the input method.
5. Extension of industry trends
The Ministry of Housing and Urban-Rural Development recently released new regulations on "Steel for Reinforced Concrete" (2024 Draft for Comments), which plans to cancel the compulsory certification requirements for secondary steel. This topic is discussed in the industry an average of 12,000 times a day. It is recommended to continue to pay attention to the following key nodes:
| Time node | matters | Scope of influence |
|---|---|---|
| 2024.9.1 | Hearing on new regulations | Manufacturer |
| 2025.1.1 | Possible implementation date | Designer/Constructor |
This article combines practical skills and industry hot spots to help readers master the input method of secondary steel symbols and understand the latest industry trends. It is recommended to save it for later use and pay attention to subsequent specification updates.
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