GB/T 5687.4-2016 in English

VALID

Nitrogen-bearing ferrochromium and nitride ferrochrome with high nitrogen content—Determination of nitrogen content—The distillation-neutralization titration method

Issued on:2017-05-01
Implemented on:2017-05-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $100.00
$97.00

Standard No:	GB/T 5687.4-2016
Document status:	VALID
Title in English:	Nitrogen-bearing ferrochromium and nitride ferrochrome with high nitrogen content—Determination of nitrogen content—The distillation-neutralization titration method
Title in Chinese:	氮化铬铁和高氮铬铁氮含量的测定蒸馏-中和滴定法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2017-05-01
Implemented on:	2017-05-01
Superseding:	GB/T 5687.4-1985 Methods for chemical analysis of ferro-chromium; The neutralization titration method for the determination of nitrogen content
ICS Classification:	77.100-Ferroalloys
Chinese Classification:	H11-Steel and iron alloy analysis method
Professional Classification:	GB-National Standard
Related Keywords:	distillation-neutralization titration method introduction high nitrogen ferrochrome distillation-neutralization titration device aminosulfonic acid standard titration solution neutralization titration
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《GB/T 5687.4-2016氮化铬铁和高氮铬铁氮含量的测定蒸馏-中和滴定法》由TC318（全国生铁及铁合金标准化技术委员会）归口，主管部门为中国钢铁工业协会。

Introduction

1. Standard background and technical evolution analysis

GB/T5687.4-2016 is a method for determining the nitrogen content in nitrided ferrochrome and high-nitrogen ferrochrome, replacing the original GB/T5687.4-1985. The new standard has made important adjustments in terms of determination range, reagent preparation and sample decomposition method.

Main Technical Changes

Expanded the determination range of high nitrogen ferrochrome (>7.00%~12.00%)
Optimized the preparation and calibration methods of aminosulfonic acid standard titration solution
Adjusted the sample particle size requirements to distinguish between easily breakable and non-breakable samples
Improved the distillation device and added a waste liquid bottle

2. Comparison of Standard Frameworks

Standard Number	Determination Range	Reagent Requirements	Analysis Steps
GB/T5687.4-2016	Nitrided ferrochrome: 2.00%~7.00%; high nitrogen ferrochrome: >7.00%~12.00%	Standard titration solutions of hydrochloric acid, sulfuric acid, phosphoric acid and aminosulfonic acid	Decompose the sample with hydrochloric acid, separate ammonia by distillation, and determine by neutralization titration
GB/T5687.4-1985	≤1.00%~10.00%	Hydrochloric acid and potassium permanganate solution	Determine by neutralization titration

3. Implementation suggestions and precautions

3.1 Laboratory preparation

Ensure that the laboratory is equipped with a distillation-neutralization titration device, including a steam generator, a condenser and a waste liquid bottle
Configure the required analytical reagents, especially the aminosulfonic acid standard titration solution, which must be accurately calibrated
Operators should receive professional training and be familiar with the use of the equipment and safety precautions

3.2 Sample Processing Recommendations

Choose an appropriate decomposition method based on the characteristics of the sample (easily soluble vs. insoluble)
Accurately weigh the sample to ensure that it meets quality requirements
Record the various parameters of the distillation process (such as temperature and time) to trace the result deviation

3.3 Data Processing and Reporting

Pay attention to unit conversion and the number of decimal places when calculating nitrogen content
Record the blank test value to ensure the accuracy of the result
The analysis result should retain three significant digits and indicate the allowable difference range

More samples: QC/T 942-2021 GB 50021-2001(2009) DL/T 5154-2012

Sample only — not a preview of GB/T 5687.4-2016

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