GB/T 9971-2017 in English
VALIDPure iron raw material
- Issued on:2017-12-29
- Implemented on:2018-09-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
Price(USD)：
$160.00
$156.00
$156.00
| Standard No: | GB/T 9971-2017 |
| Document status: | VALID |
| Title in English: | Pure iron raw material |
| Title in Chinese: | 原料纯铁 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2017-12-29 |
| Implemented on: | 2018-09-01 |
| Superseding: |
GB/T 9971-2004 Pure iron for raw meterial
|
| ICS Classification: | 77.080.10-Irons |
| Chinese Classification: | H53-Electrotechnical steel |
| Professional Classification: | GB-National Standard |
| Related Keywords: | raw pure iron
raw pure iron products pure iron iron pretreatment raw material introduction in-depth interpretation |
| Related Topics: | pure in pure
atomic purity Junji atomic purity atomic purity pure iron To pure material pure machine fuel Ferrite raw material GBT9971 GB/T 9971-1988 GB/T 9971-2004 GB/T 9971-2017 Ironmaking raw materials pure iron execution Raw material pure iron USA High purity iron quality Ferrous raw material processing Raw material pure iron Analyze pure iron gb/t9971-2017 |
《GB/T 9971-2017原料纯铁》由TC183（全国钢标准化技术委员会）归口，TC183SC10（全国钢标准化技术委员会特殊合金分会）执行，主管部门为中国钢铁工业协会。
Introduction
In-depth interpretation of the National Standard of the People's Republic of China GB/T 9971—2017
Standard Overview and Background Analysis
GB/T 9971—2017 "Raw Pure Iron" is the quality standard for raw pure iron products for uses such as electric heating alloys, precision alloys, and low-carbon stainless steel. This standard replaces the old version GB/T9971-2004. The main technical changes include:
- Cancel the varieties of initial rolling billets and related requirements
- Add the product grade YT4
- Adjust the upper limit of chemical composition control and increase the requirements for oxygen and titanium content
- Clarify the requirements for smelting methods
- Refine the surface quality standards
Comparative analysis of grades and chemical composition
| Grade | C(Carbon) | Si(Silicon) | Mn(Manganese) | P(Phosphorus) | S(Sulfur) | Cr(Chromium) | Ni(Nickel) | Al(Aluminum) | Cu(Copper) | Ti(titanium) |
|---|---|---|---|---|---|---|---|---|---|---|
| YT1 | 0.010 | 0.060 | 0.100 | 0.015 | 0.010 | 0.020 | 0.020 | 0.020 | 0.100 | 0.050 |
| YT2 | 0.008 | 0.030 | 0.060 | 0.012 | 0.007 | 0.005 | 0.020 | 0.020 | 0.050 | 0.015 |
| YT3 | 0.005 | 0.010 | 0.040 | 0.009 | 0.005 | 0.003 | 0.020 | 0.020 | 0.030 | 0.008 |
| YT4 | 0.005 | 0.010 | 0.020 | 0.005 | 0.003 | N/A | 0.020 | 0.020 | 0.020 | 0.010 |
Smelting Method and Quality Control
The smelting method of raw pure iron must meet the process of electric arc furnace plus vacuum refining or molten iron pretreatment plus converter plus vacuum refining to ensure product quality. Here are some key points:
- Electric arc furnace is used for preliminary smelting, and vacuum refining further improves purity
- Chemical composition analysis adopts GB/T223 series standard methods to ensure data accuracy
- Oxygen content control is crucial to material performance, especially the application of induction furnace combustion method
Implementation suggestions and practical applications
In actual production, companies should:
- Strictly order according to standards and ensure that the contract contains all necessary information (such as brand, size, surface quality, etc.)
- Optimize smelting process parameters, especially the vacuum refining link
- Strengthen the inspection of chemical composition and surface quality, and equip with advanced spark spectrometers and spark spectrometers>Infrared Analyzer
Sample only — not a preview of GB/T 9971-2017
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