Some standard content:
JB/T9228--1999
This standard is a revision of ZBJ31010--90 "Spheroidizing Agent for Ductile Iron". During the revision, the original standard was edited and the main technical content remained unchanged.
This standard replaces ZBJ31010-90 from the date of implementation. Appendix A of this standard is the standard appendix.
Appendix B of this standard is the reminder appendix.
This standard is proposed and managed by the National Technical Committee for Foundry Standardization. The drafting unit of this standard: Shenyang Foundry Research Institute. The main drafters of this standard: Liang Guiyun, Zhao Yu, Zhu Lei, Zhong Jinhui, Shi Runying. 464
Machinery Industry Standard of the People's Republic of China
Spheroidizers for spheroidal graphite cast irons
Spheroidizers for spheroidal graphite cast ironsJB/T 9228
Replaces ZB131010-90
This standard specifies the technical requirements, test methods, inspection rules, packaging, storage and transportation, marking and quality certificates for spheroidizers for spheroidal graphite cast iron. This standard is applicable to various spheroidizers for the production of spheroidal graphite cast iron (hereinafter referred to as spheroidizers). 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T3499—1995 Magnesium ingot for remelting
GB/T3650—1995 General provisions for acceptance, packaging, storage, transportation, marking and quality certificate of ferroalloys GB/T 4010---1994
Taking and preparing samples for chemical analysis of ferroalloys YB/T2503—1977
3 Grades
Chemical analysis methods for rare earth ferrosilicon alloys and rare earth ferrosilicon magnesium alloys The spheroidizer is divided into 12 grades according to the chemical composition content of the main elements, as specified in Table 1. 4 Technical requirements
4.1 Chemical composition
The chemical composition of the spheroidizer shall comply with the provisions of Table 1. 4.2 Physical state
The cross section of the rare earth ferrosilicon alloy spheroidizer is blue-gray. The newly pressed low-silicon block spheroidizer is a uniform silver-white block, and it is silver-gray after storage. The spheroidizer shall not be powdered.
4.3 Supply particle size
The supply particle size of rare magnesium ferrosilicon alloy spheroidizer is divided into the following three grades: 515mm, 10~～25mm, 20~40mm. The out-of-standard particle size shall not exceed 5% of the total weight. According to the negotiation between the supply and demand parties, it can also be supplied in large pieces. The supply particle size of low silicon pressed spheroidizer is determined by negotiation between the supply and demand parties.
4.4 Magnesium oxide content
The magnesium oxide content in the spheroidizer shall not be greater than 1.0%. Table 1
QRMg5RE1
4. 0≤6. 00. 5~<1. 535. 0~44. 0Approved by the State Bureau of Machinery Industry on June 24, 1999Ca
Points, %
Implemented on January 1, 2000
QRMg7RE1
QRMg6RE2
JB/T9228-1999
Continued Table 1
0. 5~<1. 5
135.0~44.0
5. 0~7. 0
QRMg7HRE26.0～<8.0
QRMg8RE3
QRMg8RE5
QRMg8RE?
<2. 5/35. 0~44. 0
35.0~~44.0
7.0~≤9. 02. 5~||tt| |~≤1.035.0~14.0
7.0~~<9.014. 0~
6.0|35.0~~44.0
7.09.06.0~8.035.0~44.0
QRMg10RE79.0~≤11.06.0~<8.035.0~44.0QLMg6RE2
QLMg8RE3
QLMg8RE5
1. 5~<2. 5
2.5～3.5
4.5～5.5
7. 5~8. 5
points, %
2. 0～3. 0
2.0～3.5
Q, R, L are the Chinese phonetic initials of spheroidizing agent, hot melting method and cold pressing method respectively. 1
2HRE is the code for heavy rare earth
5Test method
5.1 Sampling
5.1.1 Production inspection sampling
5.1.1.1 Production inspection sampling of rare earth magnesium silicon iron alloy spheroidizer. a) Alloy ingots below 250kg
Take a small alloy block at each of the four equal points along the diagonal on the center surface of the alloy ingot, that is, take a total of 5 small samples, as shown in Figure 1. The weight of each small sample should be approximately equal, and the total weight of the samples should not be less than 1kg. All the small samples taken are mixed for sample preparation. b) Alloy ingots of 250kg or more
Take a small alloy block at each of the four equal points along the diagonal on the upper and lower surfaces and the center surface of the alloy ingot, that is, take a total of 15 small samples, as shown in Figure 2. The weight of each small sample should be approximately equal, and the total weight of the samples should not be less than 3kg. All the small samples taken should be mixed for sample preparation. Figure 1
JB/T9228
5.1.1.2 Sampling for production inspection of low silicon briquette spheroidizer 5 points should be randomly selected from different parts of the uniformly mixed batch material, and the weight of each sample should be approximately equal, and the total weight of the samples should not be less than 1kg. All the samples taken should be mixed for sample preparation. 5.2 Verification sampling of rare earth magnesium-silicon-iron alloy and low silicon briquette spheroidizer: randomly take 100 or 1000 dry samples of equal quantity from each barrel. The weight of each sample should be approximately equal. The total weight of the samples shall not be less than 10000. All the samples taken shall be mixed for sample preparation. 5.2 Rare earth magnesium-silicon-iron alloy and low silicon briquette spheroidizer chemical analysis sample preparation method shall be carried out in accordance with G13/T4010. 5.3 Chemical analysis of rare earth magnesium-silicon-iron alloy and low silicon briquette spheroidizer chemical analysis method shall be carried out in accordance with YB/T2503. The magnesium oxide analysis method is shown in Appendix A (Appendix to the standard). 6 Inspection rules
6.1 Batch
6.1. 1 Production inspection sampling batch
Each furnace of rare earth magnesium ferrosilicon alloy spheroidizer alloy ingots is a batch. Every 500kg of low silicon briquette spheroidizer is a batch, and the part not exceeding 500kg is another batch. Take samples from each batch. 6.1.2 Verification sampling batch
The batch and sampling quantity of rare earth magnesium ferrosilicon alloy and low silicon briquette spheroidizer shall be carried out according to the number of barrels purchased by the purchaser and the provisions of Table 2. Table 2
Number of barrels per batch
Number of sampling barrels%
6.1.3 The same brand of spheroidizer constitutes a batch. 6.2 Acceptance conditions
3~～20
21 ～50
The acceptance of rare earth magnesium ferrosilicon alloy spheroidizer shall be carried out in accordance with the provisions of Chapter 1 of GB/T3650-1995 and Chapter 4 of the standard. If all the products are qualified, the batch of products shall be qualified, otherwise they shall be unqualified. The chemical composition acceptance of low silicon briquette spheroidizer shall be carried out in accordance with the provisions of (1.6 rare earth magnesium ferrosilicon alloy in GB/T3650·1995 and Chapter 4 of this standard. If it is unqualified, it is allowed to take double the number of samples for re-inspection. If there are · items unqualified in the re-inspection results, the batch of products shall be unqualified.
Packaging, storage, transportation, marking and quality certificate 7.1 Packaging
Application of rare earth magnesium ferrosilicon alloy and low silicon briquette spheroidizer The clean iron barrel is lined with a plastic bag and sealed, and the barrel cover is tightly sealed: the net weight of the other parts is 50kg. The spheroidizer in the same barrel is not allowed to have two or more grades of particle size. 7.2 Storage, transportation, marking and quality certificate
The storage, transportation, marking and quality certificate of rare earth magnesium ferrosilicon alloy and low silicon briquette spheroidizer shall be carried out in accordance with GB/T3650, and the magnesium content and supply particle size shall be indicated.
7.3The technical requirements, test methods, inspection rules, packaging, storage, transportation, marking and quality certificate of Mg99 spheroidizer shall be in accordance with the provisions of (13/T3199 167
A1 Method Summary
JB/T 9228 - 1999
Appendix A
(Standard Appendix)
Chemical analysis method of magnesium oxide in spheroidizing agent The sample is leached with 1% potassium dichromate solution. Under the selected leaching conditions, the phase separation of magnesium oxide and alloy magnesium can be achieved. In the potassium dichromate solution, there is a balanced reaction between dichromic acid and chromic acid: Cr:0, +H,0 2HCr0 —-2H+ 1 20r0 Alkaline magnesium oxide reacts with hydrolyzed chromic acid (pH 5) to form soluble magnesium chromate: MgO+H.CrO,→MgCrO,+HO
A2 Reagents
A2.1 Potassium dichromate solution (4%).
A2.2 Perchloric acid,
Hydrochloric acid (1→1).
A2.4 Sodium hydroxide solution (10%).
A2.5 Peacock green indicator solution (0.2%). A2.6
Acid blue K indicator solution (0.2%). A2.7
Phenol green B indicator solution (0.2%). Chrome black T indicator, 100g sodium chloride is ground, add 1g chrome black T, and then ground again to mix with ammonia buffer solution (pH 10). Weigh 67g ammonium chloride and dissolve it in 300ml water, add 570mL ammonia water, transfer to 1000ml capacity A2.9
bottle, dilute to scale with water, and shake to mix. A2.10 Triethanolamine solution (1+9).
A2.11 Ethanol bis(α-aminoethyl) ether tetraacetic acid (EGTA) solution, about 0.025M Weigh 9.510g EGTA in a 1000ml beaker. Add 500ml water and 50ml 1mol/l potassium hydroxide solution, heat and stir continuously to dissolve it completely, cool to room temperature and transfer to 1000ml. In a volumetric flask, dilute to the mark with water, shake well, no calibration is required. A2.12 1.2-Cyclohexylaminetetraacetic acid standard solution (CYDTA) 0.01M, weigh 6.930g of CYDTA in a 1000ml beaker. Add 500ml of water and 50ml of 1mol/l potassium hydroxide solution, heat and stir continuously to dissolve it completely, after cooling, transfer to a 2000ml volumetric flask, dilute to the mark with water, shake well, and calibrate with pure zinc or pure magnesium oxide before use. A3 Instrument
Electric oscillator (240 times/min)
A4 Phase separation and determination method
A4.1 Phase separation method
A4.1.1 During phase separation, weigh two samples for determination and take the average value. A4.1.2 Weigh 0.2~0.4g of the sample, accurate to 0.001g. A4.1.3 Place the sample (A4.1.2) in a 150 ml flask, add 25 ml potassium dichromate (A2.1), add 1/4 filter paper, plug with rubber, shake on an oscillator for 30 min (or stir by hand for 45 min), remove and filter with slow quantitative filter paper into a 200 ml volumetric flask, wash with water, 34 times for the flask, and the residue with filter paper 7-8 times, wash until no yellow potassium dichromate is present, dilute with water to the scale, shake, and wait for the determination of magnesium content in magnesium oxide.
A4.2 Determination method
A4.2.1 Slow method
JB/T9228---1999
A4.2.1.1 From the solution of the magnesium oxide volumetric flask separated in A4.1.3, transfer 50ml of the solution into a 200mL beaker, place it on a low-temperature electric furnace, heat and evaporate until the solution volume is 3-5mL, add 5mL of perchloric acid (A2.2), and heat until smoke comes out. Add hydrochloric acid (A2.3) to drive out the chromium, continue to heat until white smoke comes out, oxidize the remaining chromium to hexavalent, and then add hydrochloric acid (A2.3) until most of the chromium is driven out, and evaporate to . Remove and cool slightly, wash the cup wall with water, dilute with water to a volume of 50-60 mL, heat and boil to dissolve the salts. A4.2.1.2 After cooling, add 2 drops of malachite green indicator (A2.5), add sodium hydroxide solution (A2.4) and stir until the solution changes from green to colorless.
A4.2.1.3 Add 3 drops of acid chrome blue K (A2.6) and naphthol green B indicator (A2.7), and titrate with about 0.025ME(;TA solution until the red-purple color turns to bright blue, and add 2-3 drops in excess, then add hydrochloric acid (A2.3) solution in sequence until the solution turns red, and add 56 drops, then add 5-6 mL of ammonia buffer solution (A2.9), and slowly titrate with 0.01 M-CYDTA standard solution until the bright blue color is the end point. A4.2.2 Quick method
A4.2.2.1 From the solution in the magnesium oxide volumetric flask separated in A4.1.3, transfer 50 ml of the solution into a 200 ml beaker and titrate directly without chromium removal.
A4.2.2.2 Add peacock 2 drops of green indicator (A2.5), add sodium hydroxide solution (A2.4) while stirring to change the solution from green to yellow, then add 3 drops of acid chrome blue K (A2.6) and naphthol green B indicator (A2.7), titrate with about 0.025M-ECTA solution until the solution changes from dark yellow to bright green, and add 2-3 drops in excess, slowly add hydrochloric acid (A2.3) until the solution turns to clear red, and add 56 drops in excess, then add 56mL of ammonia buffer (A2.9), add a small amount of chrome black T indicator (A2.8), and titrate with 0.01M-CYDTA standard solution until the solution shows dark green as the end point.
A5 Calculation of analysis results
Calculate the percentage of magnesium oxide according to formula (A1): MgO-yxCX0. 040 3X100 %
m×200
Wherein: V--Volume of CYDTA standard titration solution, mL; C-Actual concentration of CYDTA standard titration solution, mol/L; (A1)
mMass of sample?g;
0.0403-:Mass of magnesium oxide equivalent to 1.00mL CYDTA standard titration solution [C(CYDTA)=1.000mol/1.) g. A6 Error range
Error range see Table A1.
>1. 00～5.00
≥5.00~10.00
Note: If there are Fc and AI elements, add 5ml of ethylenetriamine solution (A2.10) before titration. Allowable error
QRMg5RE1
QRMg6RE2
QRMg8RE3
QRMg8RF5
QRMg8RE7
QRMgl0RE7
QRMg7RE1
QRMg7HRE2
QI.Mg6RE2
QLMg8RE3
QRMg8RE5
Smelting method
Cupola
Continental furnace
JB/T 9228—
Appendix B
(Appendix of Suggestion)
Recommended conditions for use of spheroidizer
Recommended
Treatment temperature
Cupola-desulfurization-electric furnace
Cupola, electric furnace
1450~-1520 (
1450~1520C
1400~1450
1450~1520℃
1400～1520℃
0.025~～0.04
0. 06~0. 10
Applicable castings
Ferritic ductile iron parts
Pearlite ductile iron parts
There is no absolute limit for the recommended applicable casting types
Ferritic ductile iron parts
Pearlite ductile iron parts
Various ductile iron parts
Large-section ductile iron parts
Various ductile iron parts
When producing pearlite parts, suitable metals such as Cu and Ni can be melted in or added
It can be used alone or mixed with ordinary spheroidizing agents
If necessary, appropriate amount of rare earth magnesium ferrosilicon can be addedPotassium hydroxide solution 50ml, heat and stir continuously to dissolve completely, cool to room temperature and transfer to 1000ml. Dilute to scale with water in a volumetric flask, shake well, no calibration required, A2.121.2-Cycloethylaminetetraacetic acid standard solution (CYDTA) 0.01M, weigh CYDTA 6.930g in a 1000ml beaker. Add 500ml of water and 50ml of 1mol/l potassium hydroxide solution, heat and stir continuously to dissolve completely, cool, transfer to a 2000ml volumetric flask, dilute to scale with water, shake well, and calibrate with pure zinc or pure magnesium oxide before use. A3 Instrument
Electric oscillator (240 times/min)
A4 Phase separation and determination method
A4.1 Phase separation method
A4.1.1 Weigh two samples for determination during phase separation and take the average value. A4.1.2 Weigh 0.2~0.4g of the sample, accurate to 0.001g. A4.1.3 Place the sample (A4.1.2) in a 150ml flask, add 25ml potassium dichromate (A2.1), add 1/4 filter paper, plug with rubber, oscillate in an oscillator for 30min (or stir by hand for 45min), remove and filter with slow quantitative filter paper in a 200ml volumetric flask, wash with water, flask 34 times, residue and filter paper 7-8 times, wash until no yellow potassium dichromate is present, dilute with water to the scale, shake, and wait for the determination of magnesium content in magnesium oxide.
A4.2 Determination method
A4.2.1 Slow method
JB/T9228---1999
A4.2.1.1 From the solution of the magnesium oxide volumetric flask separated in A4.1.3, transfer 50ml of the solution into a 200mL beaker, place it on a low-temperature electric furnace, heat and evaporate until the solution volume is 3-5mL, add 5mL of perchloric acid (A2.2), and heat until smoke comes out. Add hydrochloric acid (A2.3) to drive out the chromium, continue to heat until white smoke comes out, oxidize the remaining chromium to hexavalent, and then add hydrochloric acid (A2.3) until most of the chromium is driven out, and evaporate to . Remove and cool slightly, wash the cup wall with water, dilute with water to a volume of 50-60 mL, heat and boil to dissolve the salts. A4.2.1.2 After cooling, add 2 drops of malachite green indicator (A2.5), add sodium hydroxide solution (A2.4) and stir until the solution changes from green to colorless.
A4.2.1.3 Add 3 drops of acid chrome blue K (A2.6) and naphthol green B indicator (A2.7), and titrate with about 0.025ME(;TA solution until the red-purple color turns to bright blue, and add 2-3 drops in excess, then add hydrochloric acid (A2.3) solution in sequence until the solution turns red, and add 56 drops, then add 5-6 mL of ammonia buffer solution (A2.9), and slowly titrate with 0.01 M-CYDTA standard solution until the bright blue color is the end point. A4.2.2 Quick method
A4.2.2.1 From the solution in the magnesium oxide volumetric flask separated in A4.1.3, transfer 50 ml of the solution into a 200 ml beaker and titrate directly without chromium removal.
A4.2.2.2 Add peacock 2 drops of green indicator (A2.5), add sodium hydroxide solution (A2.4) while stirring to change the solution from green to yellow, then add 3 drops of acid chrome blue K (A2.6) and naphthol green B indicator (A2.7), titrate with about 0.025M-ECTA solution until the solution changes from dark yellow to bright green, and add 2-3 drops in excess, slowly add hydrochloric acid (A2.3) until the solution turns to clear red, and add 56 drops in excess, then add 56mL of ammonia buffer (A2.9), add a small amount of chrome black T indicator (A2.8), and titrate with 0.01M-CYDTA standard solution until the solution shows dark green as the end point.
A5 Calculation of analysis results
Calculate the percentage of magnesium oxide according to formula (A1): MgO-yxCX0. 040 3X100 %
m×200
Wherein: V--Volume of CYDTA standard titration solution, mL; C-Actual concentration of CYDTA standard titration solution, mol/L; (A1)
mMass of sample?g;
0.0403-:Mass of magnesium oxide equivalent to 1.00mL CYDTA standard titration solution [C(CYDTA)=1.000mol/1.) g. A6 Error range
Error range see Table A1.
>1. 00～5.00
≥5.00~10.00
Note: If there are Fc and AI elements, add 5ml of ethylenetriamine solution (A2.10) before titration. Allowable error
QRMg5RE1
QRMg6RE2
QRMg8RE3
QRMg8RF5
QRMg8RE7
QRMgl0RE7
QRMg7RE1
QRMg7HRE2
QI.Mg6RE2
QLMg8RE3
QRMg8RE5
Smelting method
Cupola
Continental furnace
JB/T 9228—
Appendix B
(Appendix of Suggestion)
Recommended conditions for use of spheroidizer
Recommended
Treatment temperature
Cupola-desulfurization-electric furnace
Cupola, electric furnace
1450~-1520 (
1450~1520C
1400~1450
1450~1520℃
1400～1520℃
0.025~～0.04
0. 06~0. 10
Applicable castings
Ferritic ductile iron parts
Pearlite ductile iron parts
There is no absolute limit for the recommended applicable casting types
Ferritic ductile iron parts
Pearlite ductile iron parts
Various ductile iron parts
Large-section ductile iron parts
Various ductile iron parts
When producing pearlite parts, suitable metals such as Cu and Ni can be melted in or added
It can be used alone or mixed with ordinary spheroidizing agents
If necessary, appropriate amount of rare earth magnesium ferrosilicon can be addedPotassium hydroxide solution 50ml, heat and stir continuously to dissolve completely, cool to room temperature and transfer to 1000ml. Dilute to scale with water in a volumetric flask, shake well, no calibration required, A2.121.2-Cycloethylaminetetraacetic acid standard solution (CYDTA) 0.01M, weigh CYDTA 6.930g in a 1000ml beaker. Add 500ml of water and 50ml of 1mol/l potassium hydroxide solution, heat and stir continuously to dissolve completely, cool, transfer to a 2000ml volumetric flask, dilute to scale with water, shake well, and calibrate with pure zinc or pure magnesium oxide before use. A3 Instrument
Electric oscillator (240 times/min)
A4 Phase separation and determination method
A4.1 Phase separation method
A4.1.1 Weigh two samples for determination during phase separation and take the average value. A4.1.2 Weigh 0.2~0.4g of the sample, accurate to 0.001g. A4.1.3 Place the sample (A4.1.2) in a 150ml flask, add 25ml potassium dichromate (A2.1), add 1/4 filter paper, plug with rubber, oscillate in an oscillator for 30min (or stir by hand for 45min), remove and filter with slow quantitative filter paper in a 200ml volumetric flask, wash with water, flask 34 times, residue and filter paper 7-8 times, wash until no yellow potassium dichromate is present, dilute with water to the scale, shake, and wait for the determination of magnesium content in magnesium oxide.
A4.2 Determination method
A4.2.1 Slow method
JB/T9228---1999
A4.2.1.1 From the solution of the magnesium oxide volumetric flask separated in A4.1.3, transfer 50ml of the solution into a 200mL beaker, place it on a low-temperature electric furnace, heat and evaporate until the solution volume is 3-5mL, add 5mL of perchloric acid (A2.2), and heat until smoke comes out. Add hydrochloric acid (A2.3) to drive out the chromium, continue to heat until white smoke comes out, oxidize the remaining chromium to hexavalent, and then add hydrochloric acid (A2.3) until most of the chromium is driven out, and evaporate to . Remove and cool slightly, wash the cup wall with water, dilute with water to a volume of 50-60 mL, heat and boil to dissolve the salts. A4.2.1.2 After cooling, add 2 drops of malachite green indicator (A2.5), add sodium hydroxide solution (A2.4) and stir until the solution changes from green to colorless.
A4.2.1.3 Add 3 drops of acid chrome blue K (A2.6) and naphthol green B indicator (A2.7), and titrate with about 0.025ME(;TA solution until the red-purple color turns to bright blue, and add 2-3 drops in excess, then add hydrochloric acid (A2.3) solution in sequence until the solution turns red, and add 56 drops, then add 5-6 mL of ammonia buffer solution (A2.9), and slowly titrate with 0.01 M-CYDTA standard solution until the bright blue color is the end point. A4.2.2 Quick method
A4.2.2.1 From the solution in the magnesium oxide volumetric flask separated in A4.1.3, transfer 50 ml of the solution into a 200 ml beaker and titrate directly without chromium removal.
A4.2.2.2 Add peacock 2 drops of green indicator (A2.5), add sodium hydroxide solution (A2.4) while stirring to change the solution from green to yellow, then add 3 drops of acid chrome blue K (A2.6) and naphthol green B indicator (A2.7), titrate with about 0.025M-ECTA solution until the solution changes from dark yellow to bright green, and add 2-3 drops in excess, slowly add hydrochloric acid (A2.3) until the solution turns to clear red, and add 56 drops in excess, then add 56mL of ammonia buffer (A2.9), add a small amount of chrome black T indicator (A2.8), and titrate with 0.01M-CYDTA standard solution until the solution shows dark green as the end point.
A5 Calculation of analysis results
Calculate the percentage of magnesium oxide according to formula (A1): MgO-yxCX0. 040 3X100 %
m×200
Wherein: V--Volume of CYDTA standard titration solution, mL; C-Actual concentration of CYDTA standard titration solution, mol/L; (A1)
mMass of sample?g;
0.0403-:Mass of magnesium oxide equivalent to 1.00mL CYDTA standard titration solution [C(CYDTA)=1.000mol/1.) g. A6 Error range
Error range see Table A1.
>1. 00～5.00
≥5.00~10.00
Note: If there are Fc and AI elements, add 5ml of ethylenetriamine solution (A2.10) before titration. Allowable error
QRMg5RE1
QRMg6RE2
QRMg8RE3
QRMg8RF5
QRMg8RE7
QRMgl0RE7
QRMg7RE1
QRMg7HRE2
QI.Mg6RE2
QLMg8RE3
QRMg8RE5
Smelting method
Cupola
Continental furnace
JB/T 9228—
Appendix B
(Appendix of Suggestion)
Recommended conditions for use of spheroidizer
Recommended
Treatment temperature
Cupola-desulfurization-electric furnace
Cupola, electric furnace
1450~-1520 (
1450~1520C
1400~1450
1450~1520℃
1400～1520℃
0.025~～0.04
0. 06~0. 10
Applicable castings
Ferritic ductile iron parts
Pearlite ductile iron parts
There is no absolute limit for the recommended applicable casting types
Ferritic ductile iron parts
Pearlite ductile iron parts
Various ductile iron parts
Large-section ductile iron parts
Various ductile iron parts
When producing pearlite parts, suitable metals such as Cu and Ni can be melted in or added
It can be used alone or mixed with ordinary spheroidizing agents
If necessary, appropriate amount of rare earth magnesium ferrosilicon can be addedTitrate 0.25M-E(;TA solution until the red-purple color turns to bright blue, and add 2-3 drops in excess. Add hydrochloric acid (A2.3) solution in sequence until it turns red, and add 5-6 drops. Add 5-6mL of ammonia buffer solution (A2.9), and slowly titrate with 0.01M-CYDTA standard solution until bright blue is the end point. A4.2.2 Quick method
A4.2.2.1 From the solution of the magnesium oxide volumetric flask separated in A4.1.3, transfer 50ml of the solution into a 200ml beaker and titrate directly without chromium removal.
A4.2.2.2 Add 2 drops of malachite green indicator (A2.5), and add sodium hydroxide solution while stirring Liquid (A2.4) to make the solution change from green to yellow, then add 3 drops of acid chrome blue K (A2.6) and naphthol green B indicator (A2.7), and titrate with about 0.025M-ECTA solution until the solution changes from dark yellow to bright green, and add 2-3 drops in excess, slowly add hydrochloric acid (A2.3) until it turns clear red, and add 56 drops in excess, then add 56mL of ammonia buffer (A2.9), add a small amount of chrome black T indicator (A2.8), and titrate with 0.01M-CYDTA standard solution until the solution shows dark green as the end point.
A5 Calculation of analysis results
Calculate the percentage of magnesium oxide according to formula (A1): MgO-yxCX0. 040 3X100 %
m×200
Wherein: V--Volume of CYDTA standard titration solution, mL; C-Actual concentration of CYDTA standard titration solution, mol/L; (A1)
mMass of sample?g;
0.0403-:Mass of magnesium oxide equivalent to 1.00mL CYDTA standard titration solution [C(CYDTA)=1.000mol/1.) g. A6 Error range
Error range see Table A1.
>1. 00～5.00
≥5.00~10.00
Note: If there are Fc and AI elements, add 5ml of ethylenetriamine solution (A2.10) before titration. Allowable error
QRMg5RE1
QRMg6RE2
QRMg8RE3
QRMg8RF5
QRMg8RE7
QRMgl0RE7
QRMg7RE1
QRMg7HRE2
QI.Mg6RE2
QLMg8RE3
QRMg8RE5
Smelting method
Cupola
Continental furnace
JB/T 9228—
Appendix B
(Appendix of Suggestion)
Recommended conditions for use of spheroidizer
Recommended
Treatment temperature
Cupola-desulfurization-electric furnace
Cupola, electric furnace
1450~-1520 (
1450~1520C
1400~1450
1450~1520℃
1400～1520℃
0.025~～0.04
0. 06~0. 10
Applicable castings
Ferritic ductile iron parts
Pearlite ductile iron parts
There is no absolute limit for the recommended applicable casting types
Ferritic ductile iron parts
Pearlite ductile iron parts
Various ductile iron parts
Large-section ductile iron parts
Various ductile iron parts
When producing pearlite parts, suitable metals such as Cu and Ni can be melted in or added
It can be used alone or mixed with ordinary spheroidizing agents
If necessary, appropriate amount of rare earth magnesium ferrosilicon can be addedTitrate 0.25M-E(;TA solution until the red-purple color turns to bright blue, and add 2-3 drops in excess. Add hydrochloric acid (A2.3) solution in sequence until it turns red, and add 5-6 drops. Add 5-6mL of ammonia buffer solution (A2.9), and slowly titrate with 0.01M-CYDTA standard solution until bright blue is the end point. A4.2.2 Quick methodwwW.bzxz.Net
A4.2.2.1 From the solution of the magnesium oxide volumetric flask separated in A4.1.3, transfer 50ml of the solution into a 200ml beaker and titrate directly without chromium removal.
A4.2.2.2 Add 2 drops of malachite green indicator (A2.5), and add sodium hydroxide solution while stirring Liquid (A2.4) to make the solution change from green to yellow, then add 3 drops of acid chrome blue K (A2.6) and naphthol green B indicator (A2.7), and titrate with about 0.025M-ECTA solution until the solution changes from dark yellow to bright green, and add 2-3 drops in excess, slowly add hydrochloric acid (A2.3) until it turns clear red, and add 56 drops in excess, then add 56mL of ammonia buffer (A2.9), add a small amount of chrome black T indicator (A2.8), and titrate with 0.01M-CYDTA standard solution until the solution shows dark green as the end point.
A5 Calculation of analysis results
Calculate the percentage of magnesium oxide according to formula (A1): MgO-yxCX0. 040 3X100 %
m×200
Wherein: V--Volume of CYDTA standard titration solution, mL; C-Actual concentration of CYDTA standard titration solution, mol/L; (A1)
mMass of sample?g;
0.0403-:Mass of magnesium oxide equivalent to 1.00mL CYDTA standard titration solution [C(CYDTA)=1.000mol/1.) g. A6 Error range
Error range see Table A1.
>1. 00～5.00
≥5.00~10.00
Note: If there are Fc and AI elements, add 5ml of ethylenetriamine solution (A2.10) before titration. Allowable error
QRMg5RE1
QRMg6RE2
QRMg8RE3
QRMg8RF5
QRMg8RE7
QRMgl0RE7
QRMg7RE1
QRMg7HRE2
QI.Mg6RE2
QLMg8RE3
QRMg8RE5
Smelting method
Cupola
Continental furnace
JB/T 9228—
Appendix B
(Appendix of Suggestion)
Recommended conditions for use of spheroidizer
Recommended
Treatment temperature
Cupola-desulfurization-electric furnace
Cupola, electric furnace
1450~-1520 (
1450~1520C
1400~1450
1450~1520℃
1400～1520℃
0.025~～0.04
0. 06~0. 10
Applicable castings
Ferritic ductile iron parts
Pearlite ductile iron parts
There is no absolute limit for the recommended applicable casting types
Ferritic ductile iron parts
Pearlite ductile iron parts
Various ductile iron parts
Large-section ductile iron parts
Various ductile iron parts
When producing pearlite parts, suitable metals such as Cu and Ni can be melted in or added
It can be used alone or mixed with ordinary spheroidizing agents
If necessary, appropriate amount of rare earth magnesium ferrosilicon can be added
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