HOME   Cart(0)   Quotation   About-Us Policy PDFs Standard-List
www.ChineseStandard.net Database: 189760 (18 Oct 2025)

JB/T 6984-2013 PDF English

US$245.00 · In stock · Download in 9 seconds
JB/T 6984-2013: Chromite sand for foundry
Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure
Status: Valid

JB/T 6984: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
JB/T 6984-2013English245 Add to Cart 0-9 seconds. Auto-delivery Chromite sand for foundry Valid
JB/T 6984-1993English199 Add to Cart 2 days Chromite sand for foundry Obsolete

Excerpted PDFs (Download full copy in 9 seconds upon purchase)

PDF Preview: JB/T 6984-2013
      

Similar standards

GB/T 7143   GB/T 6967   JB/T 9220   

JB/T 6984-2013: Chromite sand for foundry

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/JBT6984-2013
JB MECHANICAL INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 91.100.15 J 31 Filing No.: 44467-2014 Replacing JB/T 6984-1993 Chromite sand for foundry ISSUED ON: DECEMBER 31, 2013 IMPLEMENTED ON: JULY 01, 2014 Issued by: Ministry of Industry and Information Technology of PRC

Table of Contents

Foreword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Terms and definitions ... 4 4 Grouping, grading and designation ... 5 5 Technical requirements ... 6 6 Test method ... 7 7 Inspection rules ... 8 8 Marking, packaging, transportation and storage ... 8 Appendix A (Informative) Comparison of sieve number and sieve hole size for foundry test sieve ... 9 Appendix B (Normative) Determination of the total iron content (ΣFe) in chromite ore for foundry ... 10 Chromite sand for foundry

1 Scope

This standard specifies the terms and definitions, grouping, grading and designations, technical requirements, test methods, inspection rules and signs, packaging, transportation and storage of chromite sand for foundry. This standard applies to chromite sand used in casting and core making of foundry.

2 Normative references

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this standard. GB/T 2684 Test methods for foundry sands and molding mixtures GB/T 5611 Foundry terminology GB/T 6682 Water for analytical laboratory use - Specification and test methods GB/T 9442 Foundry silica sand GB/T 24220 Chromium ores - Determination of hygroscopic moisture content in analytical samples - Gravimetric method GB/T 24221 Chromium ores - Determination of calcium and magnesium contents - EDTA titrimetric method GB/T 24227 Chromium ores and concentrates - Determination of silicon content - Spectrophotometric method and gravimetric method GB/T 24230 Chromium ores and concentrates - Determination of chromium content - Titrimetric method

3 Terms and definitions

The terms and definitions as defined in GB/T 5611 as well as the following terms and definitions apply to this document.

7 Inspection rules

7.1 All test sampling methods of chromite sand for foundry shall be implemented in accordance with GB/T 2684. 7.2 The mass of each batch of chromite sand for foundry shall be determined according to the supply situation, each batch shall generally not exceed 70 t. In special circumstances, it shall be resolved through negotiation between the supplier and the buyer. 7.3 Each batch of chromite sand for foundry supplied by the supplier shall be inspected in accordance with the technical requirements specified in this standard and the items agreed between the supplier and the buyer, meanwhile the inspection results and designations shall be written into the product certificate. 7.4 The purchaser can carry out quality inspection of chromite sand for foundry according to this standard. If any index in the inspection result does not meet the requirements of this standard, it shall double the samples from the same batch of products for re-inspection. If the result of the re-inspection still does not meet the requirements of this standard, the supplier and the buyer shall negotiate to resolve or entrust a qualified third-party arbitration institution selected by both parties to conduct arbitration.

8 Marking, packaging, transportation and storage

8.1 The packaging of chromite sand for foundry shall have a firm and clear mark, which shall indicate the words, designation, batch number, net weight, full name of the supplier of the chromite sand for foundry. 8.2 Chromite sand for foundry shall be packed in woven bags lined with plastic bags. The packaging must be tight, clean and moisture-proof. It can be divided into 25 kg woven bag and 1 t container bag. Or otherwise, the supplier and buyer shall agree separately according to the actual situation. 8.3 Chromite sands for foundry of different designations shall be shipped and stored separately; it must be protected from moisture and sun exposure during transportation and storage.

Appendix B

(Normative) Determination of the total iron content (ΣFe) in chromite ore for foundry B.1 Principle The sample is melted by sodium peroxide; the frit is leached by water. The iron hydroxide is precipitated by ammonia water; the precipitate is separated, then the precipitate is dissolved in hydrochloric acid. Evaporate the solution; use stannous chloride to reduce most of the trivalent iron to divalent iron; use sodium tungstate as an indicator; use titanium trichloride to reduce the remaining trivalent iron to divalent iron; use potassium dichromate to oxidize the excessive titanium trichloride. B.2 Reagents Unless otherwise specified in the analysis, only use approved analytical reagents and distilled water or water of equivalent purity, which meets the requirements of GB/T 6682. The hot water or hot solution listed in the analysis means its temperature is 60 °C ~ 80 °C. B.2.1 Sodium peroxide (Na2O2), dry powder. Note: Sodium peroxide shall be as dry as possible; once it agglomerates, it cannot be used. B.2.2 Hydrochloric acid (ρ = 1.19 g/mL). B.2.3 Hydrochloric acid (1 + 2). B.2.4 Hydrochloric acid (1 + 9). B.2.5 Hydrochloric acid (1 + 100). B.2.6 Sulfuric acid (ρ = 1.84 g/mL). B.2.7 Sulfuric acid (1 + 20). B.2.8 Phosphoric acid (ρ = 1.70 g/mL). B.2.9 Ammonia (ρ =0.91 g/mL). B.2.10 Thiophosphate mixed acid: While stirring, inject 150 mL of phosphoric B.4.1 Laboratory samples The sample for analysis is divided into quarters, to obtain finally about 20 g of the specimen, which is ground to make it all pass 106 µm (140 mesh sieve). B.4.2 Preparation of pre-dried specimen According to the requirements of GB/T 24220, the specimen is dried at a temperature of 105 °C ~ 110 °C. B.5 Analytical procedures B.5.1 Number of determinations For the same pre-dried specimen, perform at least 2 independent determinations. B.5.2 Sample amount Weigh 0.20 g of the pre-dried specimen (B.4), accurate to 0.0001 g. B.5.3 Blank test and verification test While measuring the sample, determine the blank value of the reagent. Before iron reduction (B.5.5), add 1.0 mL of ferrous ammonium sulfate solution (B.2.15) as a calibration test for adding iron (II); meanwhile analyze the same type of standard samples for verification tests. B.5.4 Decomposition of sample Put 5 g of sodium peroxide (B.2.1) in a 30 mL ~ 50 mL corundum crucible; mix it with the sample (B.5.2) uniformly; cover 1 g ~ 2 g of sodium peroxide (B.2.1). Heat it at 500 °C ~ 600 °C, until the contents of the crucible are completely melted; then heat it at about 700 °C for 5 min, until a uniform frit is obtained. Cool the crucible; place the crucible in a 600 mL beaker; add 300 mL of hot water; cover with a watch glass. After the violent reaction stops, add 20 mL of ammonium chloride solution (B.2.11); then boil it for 5 min. Take out the crucible; use hot water to rinse it. Allow the residue to settle for a few minutes; use a double-layer medium-speed filter paper to filter it. Use hot water to rinse the residue on the beaker and filter paper 3 ~ 4 times. Use hot hydrochloric acid (B.2.4) to flush the residue into the original beaker. Use hot hydrochloric acid (B.2.4) to rinse the filter paper 6 ~ 8 times; collect the rinsing liquid in the same beaker. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

Tips & Frequently Asked Questions

Question 1: How long will the true-PDF of English version of JB/T 6984-2013 be delivered?

Answer: The full copy PDF of English version of JB/T 6984-2013 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.

Question 2: Can I share the purchased PDF of JB/T 6984-2013_English with my colleagues?

Answer: Yes. The purchased PDF of JB/T 6984-2013_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. www.ChineseStandard.us -- JB/T 6984-2013 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds.

Question 5: Should I purchase the latest version JB/T 6984-2013?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JB/T 6984-2013 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.

How to buy and download a true PDF of English version of JB/T 6984-2013?

A step-by-step guide to download PDF of JB/T 6984-2013_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "JB/T 6984-2013".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3    Steps 4~6    Step 7    Step 8    Step 9