MANUFACTURE, PROCESSING AND USE OF STAINLESS STEEL: A REVIEW OF THE ...
[Pages:45]MANUFACTURE, PROCESSING AND USE OF STAINLESS STEEL:
A REVIEW OF THE HEALTH EFFECTS
__________________________
Prepared by: HJ Cross, J Beach, LS Levy, S Sadhra, T Sorahan, C McRoy
Institute of Occupational Health University of Birmingham Edgbaston Birmingham B15 2TT UK
Commissioned by: European Confederation of Iron and Steel Industries (EUROFER)
Rue du Noyer 211 B-1000 Bruxelles
Belgium
January 1999
CONTENTS
PREAMBLE .......................................................................................................... i EXECUTIVE SUMMARY ................................................................................... ii ABBREVIATIONS .............................................................................................. ix
1 METALLIC STAINLESS STEEL ......................................................... 1
1.1 METALLIC STAINLESS STEEL : MASSIVE ....................................... 1 1.1.1 General Information .................................................................................. 1 1.1.2 Information on Exposure ........................................................................... 5 1.1.3 Toxicokinetics ............................................................................................ 11 1.1.4 Toxicity....................................................................................................... 11
1.2 METALLIC STAINLESS STEEL : POWDER ........................................ 21
1.3 HAZARD ASSESSMENT ........................................................................ 22
1.4 RISK ASSESSMENT ................................................................................ 25
1.5 FUTURE RESEARCH NEEDS ................................................................ 25
2. STAINLESS STEEL MANUFACTURE ............................................... 27 2.1 GENERAL INFORMATION .................................................................... 27 2.3 TOXICOKINETICS .................................................................................. 32 2.4 TOXICITY ................................................................................................ 32 2.5 HAZARD ASSESSMENT ....................................................................... 39 2.6 RISK ASSESSMENT ................................................................................ 40 2.7 FUTURE RESEARCH NEEDS ................................................................ 41
3
STAINLESS STEEL PROCESSING .................................................... 42
3.1 WELDING OF STAINLESS STEEL ....................................................... 42 3.1.1 General Information .................................................................................. 42 3.1.2 Information on Exposure ........................................................................... 46 3.1.3 Toxicokinetics ............................................................................................ 50 3.1.4 Toxicity ...................................................................................................... 53 3.1.5 Hazard Assessment .................................................................................... 88 3.1.6 Risk Assessment ......................................................................................... 92 3.1.7 Future Research needs .............................................................................. 92
3.2 GRINDING OF STAINLESS STEEL ...................................................... 93 3.2.1 General Information .................................................................................. 93 3.2.2 Information on Exposure ........................................................................... 93 3.2.3 Toxicokinetics ............................................................................................ 97 3.2.4 Toxicity ...................................................................................................... 97 3.2.5 Hazard Assessment .................................................................................... 107 3.2.6 Risk Assessment ......................................................................................... 108 3.2.7 Future Research needs .............................................................................. 109
3.3 OTHER PROCESSES ............................................................................... 109 3.3.1 Cutting of stainless steel ............................................................................ 109 3.3.2 Polishing of stainless steel ......................................................................... 111 3.3.3 Forming of stainless steel .......................................................................... 111
APPENDIX 1 ........................................................................................................ 112
BIBLIOGRAPHY ................................................................................................ 114
REFERENCE LIST ............................................................................................ 124
PREAMBLE
This review comprises a critical evaluation of available data concerning the health effects associated with stainless steels, from manufacture through to processing and end-use.
The review has been divided into the following three sections to reflect the qualitative variations in exposure which occur:
? metallic stainless steel ? stainless steel manufacture ? stainless steel processing
The information contained in this review is intended to provide the basis of an assessment of the hazards associated with metallic stainless steel and those substances which occur during the manufacture and the processing of stainless steel.
Currently, stainless steels are classified in the European Union according to the Preparations Directive (88/379/EEC). Consequently, by using the conventional method specified in the Directive, stainless steels which contain nickel at a concentration of 1% or more are classified as category 3 carcinogens (R40) and skin sensitisers (R43). In this review, identifiable hazards associated with metallic stainless steel are evaluated against the criteria for classification, as contained in Annex VI of European Council Directive 92/32/EEC, amending Directive 67/548/EEC. The purpose of this evaluation is to establish how, based on currently available data, metallic stainless steels would be classified if they were substances.
Identifiable hazards associated with the materials occurring during the processing of stainless steel, for example welding fume or grinding dust, are also evaluated against the same classification criteria. The purpose of this evaluation is to determine how the toxicological properties of the materials concerned correlate with the classification criteria for substances, and thus enable an objective judgement of whether the materials should be considered hazardous.
The review is also intended to provide the basis of a risk assessment for those hazards which have been identified.
The final part of each section focuses on "future research needs". Gaps in the database, which have been identified during the preparation of this document, are reviewed and suggestions are put forward regarding future research needs where it is thought appropriate.
i
Within the review, each section is divided into the following sub-sections: general information; information on exposure; toxicokinetics; toxicity; hazard assessment; risk assessment; gaps in knowledge. The review was prepared using primary sources of data. In each toxicity sub-section, the review of the epidemiological literature relating to occupational cancers is limited to original publications of cohort studies. Population-based case-control studies were considered to be too problematic to include reliable analyses of detailed occupational exposures and were not evaluated.
Literature search strategy Primary sources of published data used in this review were identified using TOXLINE, NIOSHTIC, CISDOC, MEDLINE, HSELINE and the Science Citation Index databases for the period 1970 to 1996 (project start date). Key words used in the searches were "stainless steel", "chromium-nickel alloys", and "nickel alloys". References were selected from the search results using a two-stage approach. Firstly, reference abstracts were scanned for relevance to the project and selected references were then acquired. Secondly, acquired references were read in full before being selected for inclusion in the review. References included in the review are listed in the "Bibliography"; those not included are given in the "Reference List". References published subsequent to the start of the project, that is for the period 1996 to early 1998, were identified by conducting updated searches using the above databases. Further articles were identified from bibliographies of references used during the course of the project and by scanning scientific journals.
ii
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