{"id":52569,"date":"2024-09-30T08:00:32","date_gmt":"2024-09-29T23:00:32","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=52569"},"modified":"2026-07-22T16:26:06","modified_gmt":"2026-07-22T07:26:06","slug":"galvanized-specifications-thickness-quantity","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/galvanized-spec-thickness-amount\/","title":{"rendered":"A Discussion of Galvanizing Standards, Thickness, and Coating Weight"},"content":{"rendered":"

Hello, everyone.<\/p>\n

This is Enta.<\/p>\n

\"Galvanized\"<\/p>\n

Last month, I visited a galvanizing plant.<\/p>\n

My former boss changed jobs and became a director at a materials supplier, and I was given a tour of their factory.<\/p>\n

 <\/p>\n

As for the zinc material shown in the photo above, I hear that one bundle (enough to tie it up) costs about 500,000!!!!<\/p>\n

It seems that zinc materials are also becoming more expensive right now, and the cost of plating is reportedly rising.<\/p>\n

It's a tough time when everything is so expensive.<\/p>\n

\"Galvanized\"<\/p>\n

There are quite a few steps involved in the galvanizing process, and<\/p>\n

Degreasing \u2192 Rinsing \u2192 Pickling \u2192 Rinsing \u2192 Fluxing \u2192 Plating \u2192 Finishing<\/span><\/strong><\/span><\/p>\n

It seems there are actually a few more steps involved.<\/p>\n

It seems to take quite a bit of time and effort.<\/p>\n

\"Acid<\/p>\n

The photo above shows an acid washing tank.<\/p>\n

Since this company can plate large objects, they were handling some really massive items.<\/p>\n

Even if it's rusty, the rust will be completely removed during the processing.<\/p>\n

\"Galvanized\"<\/p>\n

It is slowly lowered into the plating bath and then slowly raised out of it.<\/p>\n

He said the furnace temperature was around 450 degrees.<\/p>\n

\"Galvanized\"<\/p>\n

It's like putting it in a cooling pool to set it, isn't it?<\/p>\n

Once it has cooled, it will proceed directly to the finishing process.<\/p>\n

It seemed as though the finishing process was being carefully checked and completed by hand.<\/p>\n

\"Galvanized\"<\/p>\n

Since the jigs differ depending on the part or product, I hear they make new jigs whenever a new product arrives.<\/p>\n

 <\/p>\n

Do you know how long galvanized coatings generally last?<\/p>\n

Service life = Zinc coating weight (g\/m2<\/sup>) \u00f7 corrosion rate (g\/m2<\/sup>(Year) \u00d7 0.9<\/span><\/strong><\/span><\/p>\n

Apparently, it can be calculated using this formula.<\/p>\n

 <\/p>\n

Basically, the same applies to the galvanized rebar we use.<\/p>\n

\"Plating:
Plating: Service Life by Environment<\/figcaption><\/figure>\n
\n

The amount of plating adhering to the rebar in the rebar insertion process is listed as HDZT77.<\/p>\n

This number, 77, refers to the thickness.<\/p>\n

That's 77 \u03bcm!<\/span><\/strong><\/span><\/p>\n

 <\/p>\n

Huh?<\/strong><\/span><\/p>\n

Right? lol<\/p>\n

First of all\u300c\"\u03bc\" What's this?<\/strong><\/span><\/p>\n

Right?<\/p>\n

This is called a \u201cmicro.\u201d<\/p>\n

So,1 \u03bcm = 1 micrometer<\/span><\/strong><\/span>That's right.<\/p>\n

I hear that 1 \u03bcm is \"10 to the power of -3 mm,\" lol, so that's 1\/1000 of a millimeter.<\/p>\n

 <\/p>\n

0.001 mm<\/strong><\/span><\/p>\n

That\u2019s how it works.<\/p>\n

\n

In light of the above,<\/p>\n

HDZT77 \u00d7 0.001 mm = 0.077 mm<\/strong><\/span><\/p>\n

That\u2019s how it works.<\/p>\n

 <\/p>\n

The table above showing the number of years of service is based on the amount of buildup, so it can be a little confusing, right?<\/p>\n

The table below shows the data by thickness.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Table 2\u2014Relationship Between Film Thickness and Adhesion (See Explanatory Table 1 of JIS H 8641)<\/td>\n<\/tr>\n
Coating Thickness [This Standard]<\/td>\nAdhesion [Old Standard] a)<\/sup>\uff3d<\/td>\n<\/tr>\n
Type Symbols<\/td>\nCoating Thickness (\u03bcm)<\/td>\nTypes<\/td>\nSymbol<\/td>\nAdhesion (g\/m)2<\/sup>\uff09<\/td>\n<\/tr>\n
HDZT 35<\/td>\n35 or older<\/td>\n1 Type A<\/td>\nHDZ A<\/td>\n250 or more b)<\/sup><\/td>\n<\/tr>\n
HDZT 42<\/td>\n42 or older<\/td>\nCategory 1, Type B<\/td>\nHDZ B<\/td>\n300 or more b)<\/sup><\/td>\n<\/tr>\n
HDZT 49<\/td>\n49 or more<\/td>\n2 Types 35<\/td>\nHDZ 35<\/td>\n350 or more<\/td>\n<\/tr>\n
HDZT 56<\/td>\n56 or more<\/td>\n2 types, 40<\/td>\nHDZ 40<\/td>\n400 or more<\/td>\n<\/tr>\n
HDZT 63<\/td>\n63 or more<\/td>\n2 Types 45<\/td>\nHDZ 45<\/td>\n450 or more<\/td>\n<\/tr>\n
HDZT 70<\/td>\n70 or older<\/td>\n2 types, 50<\/td>\nHDZ 50<\/td>\n500 or more<\/td>\n<\/tr>\n
HDZT 77<\/td>\n77 or more<\/td>\n2 Types 55<\/td>\nHDZ 55<\/td>\n550 or more<\/td>\n<\/tr>\n
\u6ce8 a)<\/sup>\u00a0 The old standard specifies the adhesion levels for two types.<\/td>\n<\/tr>\n
\u6ce8 b)<\/sup>\u00a0 1 The amount of species deposited is calculated by multiplying the average plating film thickness of HDZ A (35 \u03bcm) or the average plating film thickness of HDZ B (42 \u03bcm) by the density of the plating film, 7.2 g\/cm3<\/sup> As such, this shows the value derived from this.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Japan Hot-Dip Galvanizing Association (General Incorporated Association)<\/p>\n

Revisions to JIS Standards Concerning Hot-Dip Galvanizing<\/a><\/p>\n

 <\/p>\n

The HDZT77 standard specifies that the zinc coating weight must be 550 g\/m\u00b2 or more.<\/p>\n

\"Plating:
Japan Hot-Dip Galvanizing Association (General Incorporated Association)<\/figcaption><\/figure>\n

Applying this to the above,<\/p>\n

Coastal Areas: 25 years and up<\/p>\n

Urban and Industrial Areas: 1960\u2013<\/p>\n

Rural Areas: 100 Years and Up<\/p>\n

That\u2019s how it works.<\/p>\n

 <\/p>\n

And this data is for a hollow structure.<\/p>\n

Since, like us, it is embedded in concrete\u2014such as in grout\u2014its lifespan is immeasurable.<\/p>\n

On top of that, they\u2019ve even thoughtfully left a 1 mm corrosion allowance. The rebar installed by this rebar installer is seriously the best lol.<\/p>\n

It won't rust lol (I feel like I can say that with confidence.)<\/p>\n

However, this means that the likelihood of rusting increases significantly if you use sheaths or similar items.<\/p>\n

You don't need a sheath pipe for rebar insertion!<\/a><\/p>\n

 <\/p>\n

Plating is actually pretty complex, so once you start looking into it, there\u2019s no end to it lol.<\/p>\n

However, it\u2019s important to keep up with the latest developments as an engineer.<\/p>\n

For now, I think I\u2019ll be fine as long as I remember that the last digit in the HDZT 77 plating specification refers to the deposit thickness, lol.<\/p>\n

 <\/p>\n

See you later.<\/p>\n

 <\/p>\n

Corrosion Resistance of Hot-Dip Galvanizing<\/a><\/p>\n

Research Society for Galvanized Steel Structures<\/p>\n

\n

DRB Construction Method Study Group (Tentative) Information Session<\/p>\n

Application Form<\/a><\/p>","protected":false},"excerpt":{"rendered":"

Hello, everyone. This is Enta. Last month, I visited a galvanizing plant. My former boss had changed jobs and become a director at a materials supplier, so he gave me a tour of the plant. As for the galvanized material shown in the photo above, I heard that one bundle (a tied bundle) costs about 500,000 yen!!!! Right now, galvanized\u2026<\/p>","protected":false},"author":2,"featured_media":52578,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[38,36],"tags":[70,369,3630,6408,6409,6410,6411],"class_list":["post-52569","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-construction-management","category-quality","tag-70","tag-369","tag-3630","tag-6408","tag-6409","tag-6410","tag-6411"],"acf":[],"yoast_head":"\n\u4e9c\u925b\u30e1\u30c3\u30ad\u306e\u898f\u683c\u3068\u539a\u307f\u3068\u4ed8\u7740\u91cf\u306e\u8a71\u3057 - 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